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651 人参与  2023-09-22 11:54:44  分类 :考研课题库

最小单糖的分子结构中所含羟基的个数是

最小单糖的分子结构中所含氧原子的个数是

下列分子中最小的是

下列糖中,与生命活动关系最密切的己糖是

下列糖中,与生命活动关系最密切的戊糖是

判断葡萄糖的d-构型是根据其

下列单糖溶液中,没有旋光性的是

下列分子中,属于酮糖的是

还原糖的特征反应是

麦芽糖分子结构中含

没有还原性的糖是

不属于同多糖的是

能水解的糖是

属于己糖的是

不与碘发生显色反应的是

支链淀粉和糖原分子中都含有

不存在于人体中的同多糖是

纤维素不能被人体消化。

支链淀粉支链短而密,每隔6-8个葡萄糖单位有一个分支。

肝素具有抗凝血作用。

不饱和脂肪酸的分类中不包括

彻底水解一分子甘油三酯最多可以得到的分子种数是

水解1mol甘油三酯要消耗氢氧化钾的摩尔数是

碘值为0的脂类一定不含有

酸败过程发生化学反应,下列关于酸败作用的过程的叙述,错误的是

关于脂类的下列叙述,错误的是

能形成二硫键的氨基酸是:

改变氢键不会改变蛋白质的:

蛋白质的主链局部构象属于:

蛋白质的二级结构不包括:

蛋白质多肽链的方向为:

蛋白质中不存在的氨基酸是

蛋白质变性是由于

蛋白质空间构象主要取决于

每个蛋白质分子必定有

变性蛋白质溶解度降低是因为蛋白质分子的电荷被中和,表面的水化膜被破坏引起的。

蛋白质的变性是由于肽键的断裂引起高级结构的变化所致。

蛋白质分子中所有氨基酸(除gly外)都是l构型。

连接核酸结构单位的化学键是

核酸分子中储存. 传递遗传信息的关键部分是

找出对dna二级结构的不正确描述

比较rna和dna水解后的产物

存在于核酸分子中的常规碱基有

dna的一级结构是dna分子的

维持dna两股链形成双螺旋的化学键是

b-dna双螺旋模型每一螺旋的碱基数是

b-dna双螺旋每旋转一周,沿轴上升的高度是

下列几种dna分子的碱基组成比例各不相同,其tm值最低的是( )

核酸分子杂交只发生在dna单链之间

dna变性后核苷酸的排列顺序发生变化

常用的使核酸变性的方式是高温

核酸变性时,紫外吸收值增加的现象叫做 。

酶的活性中心是指

关于酶的辅基的正确叙述是

酶与一般催化剂的区别是

酶的必需基团都位于活性部位

酶只能在细胞内起作用

符合竞争性抑制作用的说法是

km值是指

米氏常数km是用来衡量

磺胺类药物能抗菌抑菌是因为

使酶发生不可逆破坏的因素是

酶原是未被激活的酶的前体

缺乏维生素c会导致

脚气病患者缺乏

防治巨幼红细胞贫血的维生素是

儿童缺乏维生素d易患

下列维生素中含金属元素钴的是

在下列维生素中,脂溶性维生素是

成人缺乏维生素d会出现

抗干眼病维生素是维生素a

缺乏维生素b12和叶酸会发生巨幼性红细胞贫血

维生素k属于水溶性维生素

在atp合酶的作用机制下,nadh氧化呼吸链在传递氢和电子的过程中,约合成多少个atp?

呼吸链中不介导氢离子跨膜运转的呼吸链复合体是

在糖有氧氧化时,肝和心肌组织胞质nadh可通过苹果酸–天冬氨酸穿梭机制进入线粒体氧化,此时,一分子葡萄糖彻底氧化可生成多少分子的atp?

细胞质中3–磷酸甘油醛或乳酸等物质脱氢生成的nadh不能直接透过线粒体内膜进入呼吸链,而需要通过特殊的穿梭系统,才能将其携带的氢转运到线粒体内,进入呼吸链氧化。其中,主要发生在脑和骨骼肌等组织的是哪种穿梭机制?

寡霉素是一种atp合酶抑制剂,其作用机制是

atp是生物体内最重要的高能化合物,直接储存在细胞中,是机体所需能量的直接供体。

机体氧化磷酸化速率主要受adp调节,当机体atp消耗增多时,adp浓度增高,促进氧化磷酸化。

不参与糖酵解作用的酶是

属于三羧酸循环的关键酶是

葡萄糖有氧氧化有几个耗能反应

.糖原合成中的“活性葡萄糖”存在于下列哪种物质

糖原分解的关键酶是

糖酵解、糖原合成、糖原分解等途径的共同中间产物是

饥饿时,肝脏内下列哪条途径的酶活性最强

能同时促进糖原、脂肪合成的激素是

供氧不足时,3-磷酸甘油醛脱氢产生的dadh h 的主要去路是

三羧酸循环发生于

既是糖酵解的产物,又是糖异生原料的是

三羧酸循环中琥珀酸转变为草酰乙酸的中间产物是

能使血糖下降的激素是

三羧酸循环是糖、脂肪、蛋白质的共同氧化途径

糖酵解终产物是二氧化碳和水

三羧酸循环脱下的氢经呼吸链传递可生成12分子atp

糖原合成时,葡萄糖的供体是udp-葡萄糖

糖异生是糖酵解的逆过程

磷酸戊糖途径的重要生理意义是可以为核酸合成提供原料

1,6-二磷酸果糖裂解成磷酸二羟丙酮和3-磷酸甘油醛

属于脂肪动员产物的是:

催化水解体内储存的甘油三酯的是:

下列激素可直接激活激素敏感性脂肪酶,例外的是:

β氧化发生于:

脂肪酸的主要氧化方式是:

在β氧化中,脂肪酸的活化形式是:

关于β氧化过程的下列叙述,正确的是:

酮体包括:

软脂酸合成的场所是:

脂肪酸合成是脂肪酸β-氧化的逆转。

酮体在肝脏内产生,在肝外组织分解,酮体是脂肪酸彻底氧化的产物。

人体能利用糖转变成脂肪,所以人不吃脂类也能生长良好。

脂肪酸在细胞质基质中活化为脂酰coa,而后进入线粒体进行β-氧化。

脑组织不能利用脂肪酸来氧化供能。

3d打印最早出现的是以下哪一种技术( )

以下不是3d打印技术优点的是( )

以下不是3d打印技术需要解决的问题是( )

最早的3d打印技术出现在什么时候( )

各种各样的3d打印机中,精度最高、效率最高、售价也相对最高的是( )

1.lom打印技术的缺点不包括以下哪一项

2.3dp技术的缺点不包括以下哪一项

3.sla 技术的优势不包括以下哪一项

4.对光敏树脂的性能要求不包括以下哪一项

5.fdm技术的优点不包括以下哪一项

1.以下是sla技术特有的后处理技术是()

2.fdm 3d打印技术成型件的后处理过程中最关键的步骤是()

3.3dp 打印技术的后处理步骤的第一步是()

4.目前fdm常用的支撑材料是()

sla原型的变形量中由于后固化收缩产生的比例是()

1.以下不是促进3d打印技术在医疗领域应用的方法是()

2.3d打印技术在建筑行业的应用中,目前使用最广泛的领域是()

3.创新是以新思维、新发明和新描述为特征的一种概念化过程。以下不是创新三层含义的是()

4.3d打印技术在医疗领域应用的四个层次特点中不包括以下哪个()

5.以下哪种3d打印技术在金属增材制造中使用最多()

1.以下不是3d打印技术优点的是

以下不是3d打印技术需要解决的问题是

sla技术使用的原材料是

目前fdm常用的支撑材料是

sla原型的变形量中由于后固化收缩产生的比例是

3dp技术使用的原材料是

以下是sla技术特有的后处理技术是

fdm 3d打印技术成型件的后处理过程中最关键的步骤是

3d打印技术在医疗领域应用的四个层次中不包括以下哪个

以下哪种3d打印技术在金属增材制造中使用最多

先进的航空发动机中已经应用到了复合材料。

sls技术打印的金属零部件致密度不能达到100%

sls技术和slm技术是一回事。

电子束3d打印金属零部件只能在真空条件下进行。

目前slm技术所用的激光器一般是小于1000瓦功率。

3d打印技术可运用于战场快速维修。

3d打印技术目前可以打印航空发动机的所有零部件。

目前市面的桌面3d打印设备可打印优良的金属零部件。

3d打印技术制造的金属零部件性能可超过锻造水平。

3d打印技术不可以打印部分陶瓷。

一只豹子在t=0时刻由静止开始以恒定的加速度沿直线奔跑,直到t=3.0s时刻为止。在t=1.0s到t=2.0s这段时间间隔内,它运动的距离

球被抛入空中,沿抛物线轨道运动。a 点是轨道的最高点,b点是球的落地点。对于两点的速率和加速度的大小,正确的选项为

定义质点经过的总路程除以全程所用的时间间隔为平均速率。一质点沿半径为r的圆周作匀速率圆周运动,在一个周期t内其平均速度的大小与平均速率分别为

将两个抛体从同一点抛出,初速率相同,抛射角与水平线的夹角分别为30º和60º。若两者落在同一位置,且忽略空气阻力。哪个物体飞行时间长(从抛出到落地所用的时间)?

将两个抛体从同一点抛出,初速率相同,抛射角与水平线的夹角分别为30º和60º。若两者落在同一位置,且忽略空气阻力。哪个物体的速度水平分量与飞行时间之积更大?

指出下列哪一种说法是错的

质点沿x轴正向运动,其加速度随位置的变化关系为:。若它在 x=0处的速度v(0)=5m/s,那么,当它达到x=3m处时的速度为

一质点沿 x 轴运动,其速度与时间的关系式为:v= 4 t 2,式中v 的单位为cm/s,t 的单位为s,当t = 3s时质点位于x= 9cm处,则质点的位置x 与时间t的关系为 (以cm为单位)

在一段时间内,质点位移的大小为lr ,运动过的路程大小为ls。则lr 与ls 间的关系为

沿直线运动的质点,其速度大小与时间成反比,则其加速度的大小

物体作直线运动,取两段连续的相等位移。已知第1段位移的平均速度为v1=10m/s;第2段位移的平均速度 v2=15m/s。则物体通过这两段位移的平均速度为

一男孩乘橡皮筏过河。河水以1 m/s的大小从北向南流动。如果他在静水中划橡皮筏的速率为1.5m/s,他应该将筏子指向什么方向才能用最短的时间过河到东岸去。

某质点作直线运动的运动学方程为x=3t -5t 3 6(si),则该质点作

一个玩具火箭从地面竖直向上射入空中,到达h高度处。从火箭开始射出的时刻计时。经过时间dt 后,火箭落回到其地面上的发射点。对于这段时间,火箭的平均速度为

卫星在轨道上绕地球沿逆时针方向作匀速圆周运动,如图。卫星运行四分之一圆周从c点到d点,在这段时间间隔内,平均速度的指向为

卫星在轨道上绕地球沿逆时针方向作匀速圆周运动,如图。卫星运行半圆周从c点到a点,在这段时间间隔内,平均加速度的指向为

某质点作直线运动的运动学方程为(si),则该质点作

一质点沿直线运动,其速度为,(式中k、为常量),当t=0时,质点的坐标为x=0,则此质点的运动方程为

两艘赛艇a 和b,从同一起始线同时出发,作同向直线运动。从出发时开始计时,a 和b 的位置随时间的变化关系分别是(si) 和(si)。出发后t 时刻两艇达到相同的行驶速度,则t 的值为

一运动员骑自行车绕圆形赛道运动一周,下列说确的是

一个质点做直线运动,在0-6s内,其位置与时间的关系曲线如图所示,为一抛物线形状,则质点在这段时间内

质点沿x 轴运动,其规律为(si),则在0-3s 内它的

某人骑自行车以速率v 向东行驶,感觉风从正北方向吹来,如果将速度提高1倍,感觉风从东北方向吹来,则实际风速和风向分别是

一质点沿x 轴运动的规律是,则0-3s内质点

一质点沿x轴作直线运动,加速度,式中的k为常量。当时,初速为,则质点速度与时间t 的函数关系是

在直角坐标系中,质点1和2的速度分别是m/s和m/s。已知t=0时,两质点的位置坐标分别为m,和,m,则t时刻两质点的相对位矢为

长度不变的杆ab在xy平面上运动,端点a以不变的速率沿y轴向下滑动,b点沿x轴移动。当ab杆与x轴夹角为时,端点b的运动速率为

在堤岸顶上用绳子拉小船。设岸顶离水面的高度为20m,收绳子的速率为3m/s,且保持不变, 若当船与岸顶的距离为40m时开始计时,则5秒时小船速度与加速度的大小分别为 m/s和 m/s2 。

一球沿斜面向上滚动,自出发时刻计时,若它运动过的距离与时间 t 的函数关系为s=3t-t 2(m),则球将在t = s时开始向下滚动。

一质点做匀速圆周运动,则

质点作曲线运动,表示位置矢量,表示速度,表示加速度,s表示路程,表示切向加速度,下列表达式中,

以下四种运动形式中,加速度保持不变的运动是

对于沿曲线运动的物体,以下几种说法中哪一种是正确的

一物体以匀角加速度作变速圆周运动。关于此运动有三个表述 (1) 加速度的大小为定值。 (2) 加速度法向分量的大小为定值。 (3) 加速度切向分量的大小为定值。 以上表述正确的是

设抛射体的初速率为v0 ,抛射角为q0,则其抛物线轨道最高点的曲率半径为

一男童在荡轮胎秋千,何时绳子中张力最大?

一质点沿圆周运动,其速率随时间成正比增大。加速度矢量与速度矢量间夹角为q,切向加速度和法向加速度的大小分别以at和an表示,试判断下列说法哪一个是正确的。

如图,质量为m 的物体用平行于斜面的细线连结并置于光滑的斜面上,若斜面向左方作加速运动,当物体脱离斜面时,它的加速度大小为

如图所示,物体b通过轻滑轮与物体a相连。 将两者由静止释放后,b以加速度a 向右运动。若去掉物体a,并以与a的重力大小相同的力向下拉动绳子,b仍能向右运动,其加速度为a¢ , 则

质量为m的物体自空中落下,它除受重力外,还受到一个与速度平方成正比的阻力的作用,比例系数为k,k为正值常量.该下落物体的收尾速度(即最后物体作匀速运动时的速度)将是

一公路的水平弯道半径r,路面的外侧高出内侧,并与水平面夹角为q。要使汽车通过该段路面时不引起侧向摩擦力,则汽车的速率为

一个质点以速率v 沿半径为r 的圆周运动,其加速度的大小为

下列四种说法,正确的是

质点沿轨道ab由a向b作曲线运动,速率逐渐减小,如图。下列图中,哪一个正确地给出了质点在c处的加速度?

一物体质量m=2 kg,在合外力 (si)的作用下,从静止开始运动,式中为方向一定的单位矢量, 则当t=2s时物体的速度为(单位取m/s)

一物体作如图所示的斜抛运动,测得在轨道p点处速度大小为v,其方向与水平方向成30°角。则物体在p点的切向加速度为(重力加速度为g)

一质点的运动轨迹如图中ab曲线所示,p为ab上的一点。某人做出了该质点经过p点时所受合力的8个可能方向,其中正确的是

一质点做圆周运动,其位置角随时间t变化的关系为。则从算起,它转过多少圈后角速度为零?

一质点做圆周运动,其角速度w 随时间t变化的函数关系为(式中,k为常量)。若t=0时,质点的位置角为零,则此质点的运动方程为

两个质量相等的小球由一轻弹簧相连接,再用一细绳悬挂于天花板上,处于静止状态,如图所示.将绳子剪断的瞬间,球1和球2的加速度分别为

下列各情况中不可能存在的是

一质点在oxy平面内运动,其运动方程为,,式中的、、均为常数。当运动质点的运动方向与x 轴正方向的夹角为45°角时,其速率为

一质量为10kg的质点从静止开始作直线运动,加速度a 随时间t变化的关系为(si)。当其速度为14m/s时,所受合力的大小为

将一物体从高处以v0的初速度水平抛出,已知该物体落地时的速率为v,那么它在空中运动的时间是

如图所示,假设物体沿着竖直面上圆弧形光滑轨道下滑,在从a至c的下滑过程中,下面说法中正确的是

一质点沿半径为r的圆周运动,质点所经过的弧长s与时间 t 的关系为s=bt 0.5ct 2 , 其中b、c是大于零的常数。则t 时刻质点的切向加速度at =________,法向加速度 an =________。



质量为m 的质点,以恒定速率v 沿图中正三角形abc的水平光滑轨道运动,质点越过a角时,轨道作用于质点的冲量的大小为

一个质点作匀速圆周运动。在某段时间内,它运动了一周回到原处。关于该质点在这一周内的运动有以下说法,其中正确的是

如图所示,砂子从h=0.8m高处下落到以3 m/s的速率水平向右运动的传送带上。取重力加速度g=10m/s2,则传送带给予刚落到传送带上的砂子的作用力的方向为

一炮弹由于特殊原因在水平飞行过程中,突然炸裂成两块,其中一块自由下落。则与炮弹不爆炸相比,另一块的着地点距抛出点(飞行过程中阻力不计)

对于图中给出的轴(轴垂直屏幕),图中哪个力的力矩方向是垂直纸面向里的?

用一水平恒力f 推一静止在水面上的物体,作用时间为dt,物体始终处于静止状态,则在dt时间内恒力f对物体的冲量和该物体所受合力的冲量大小分别是:

质量为20g的子弹沿x轴正向以 500 m/s的速率射入一木块后,与木块一起以50 m/s的速率仍沿x轴正向前进,在此过程中木块所受冲量的大小为(以n×s单位)

两个等质量的质点a和b,相距一定的距离。质点a静止,质点b以速率v向远离a的方向运动。系统质心

两密度相等的均质球体互相接触。球a的质量是球b质量的5倍。系统的质心在

用国际单位制表示,力矩与下面那个物理量的单位相同?

一木板可以沿着固定的竖直滑轨无摩擦自由下落,其上挂有一个单摆(单摆的质量远远小于木板的质量)。初始时,将木板托住,使其静止,但使单摆摆动。选在单摆已离开平衡位置但并未到达可以摆动的最高点时,将木板释放使之自由下落。则板下落过程中,摆球相对于板

以下说确的是

判断下列有关动量和角动量的说法中哪一个是正确的

如图所示,两物体a、b紧靠在一起放在光滑水平地面上,且。若以大小为f、方向向右的力作用于物体a,使两者一起运动,则a和b间作用力的大小为。若以同样大小方向向左的力作用于物体b,使两者一起运动,则a和b间作用力的大小为。以下结论正确的是

力(n)作用于质点p之上。当p的位矢为(m)时,该力对坐标原点的力矩大小为

三个质点的总质量为6kg,受力情况如图所示。该三质点系统质心的加速度(si)



一质点做抛体运动,由坐标系原点o运动到p点,如图所示。以表示该质点对o点的角动量,以下说确的是

质量m=10 kg的木箱放在地面上,在水平拉力f的作用下由静止开始沿直线运动,其拉力随时间的变化关系如图所示.若已知木箱与地面间的摩擦系数m = 0.2, 那么在t = 7s时,木箱的速度大小为______________m/s.(g取10 m/s2)

如图所示,一小球在弹簧的弹力作用下振动。弹力f = -kx,小球偏离平衡位置的位移为x = acosωt,其中k,a和ω都是常数.在t = 0到t=π/2ω的时间间隔内弹力对小球的冲量为 .

用棒打击质量为0.3kg、以速率20m/s水平飞来的球。击打后,球竖直向上升高了10m的高度。设球与棒的接触时间为0.02s,那么棒对球的冲量大小为 n·s,球受到的平均冲力大小为 n.

一人造地球卫星绕地球沿椭圆轨道运动, a 、b 分别为近地点和远地点, a 、b 距地心的距离分别为 r1、r2 。 设卫星的质量为 m ,地球的质量为m ,万有引力常量为g,则在a、b 两点处,卫星的速率之比va/vb = ;万有引力势能之差epa–epb = 。

绕定轴转动的飞轮均匀地减速, t=0 时角速度为w0=5rad/s,t=20s时角速度为w=0.8w0,则飞轮的角加速度b =_____ rad/s2, t=0到t=100s时间内飞轮所转过的角度q =________rad.

一根质量为m、长为l 的细而均匀的棒,其下端铰接在水平地板上并竖直地立起,如让它掉下,则棒将以角速度撞击w 地板,如图所示,将同样的棒截成长为 l/2 的一段,初始条件不变,则它撞击地板时的角速度最接近于

几个力同时作用在一个具有光滑固定转轴的刚体上,如果这几个力的矢量和为零,则此刚体

花样滑冰运动员绕通过自身的竖直轴转动,开始时两臂伸开,转动惯量为j0,角速度为w0.然后她将两臂收回,使转动惯量减少为j0 /3.这时她转动的角速度变为

一圆盘绕过盘心且与盘面垂直的光滑固定轴以角速度按图示方向转动。若按如图所示的情况那样,将两个大小相等、方向相反、但不在同一条直线的力沿盘面同时作用到圆盘上,则圆盘的角速度

卡车沿平直轨道以恒定加速度a 运动。为了测量车的加速度,从卡车天花板上垂挂一质量为m的均匀细长杆,若细长杆保持与铅直方向的夹角为q ,则a与q 的关系式为

如图,一匀质细杆长为l,质量为m,杆两端用线吊起,保持静止且水平。现有一条线突然断开,则断开瞬间另一条线的张力为

如图所示,一静止的均匀细棒,长为l、质量为m,可绕通过棒的端点且垂直于棒长的光滑固定轴o在水平面内转动,转动惯量为ml2/3 。一质量为m、速率为v的子弹在水平面内沿与棒垂直的方向射入并穿出棒的自由端,设穿过棒后子弹的速率为v/2,则此时棒的角速度为

质量为m的小孩站在半径为r的水平转台边缘。转台可以绕通过其中心的竖直光滑固定轴自由转动,转动惯量为j。平台和小孩开始时均静止,当小孩突然以相对于地面为v的速率在台边缘沿逆时针转向走动时,则此平台相对地面旋转的角速度和旋转方向分别为

均匀细棒oa可绕通过其一端o而与棒垂直的水平固定光滑轴转动,现使棒从水平位置由静止开始自由下落,在棒摆动到竖直位置的过程中,下列说法哪一种是正确的

一轻绳绕在具有水平光滑转轴的定滑轮上,绳下端挂一物体,物体的质量为m,此时滑轮的角加速度为aa;若将物体取下,而用大小等于mg,方向向下的力拉绳子,此时滑轮的角加速度为ab

如图所示,一匀质细杆可绕通过上端与杆垂直的水平光滑固定轴旋转,初始状态为静止悬挂.现有一个小球自左方水平打击细杆.设小球与细杆之间为非弹性碰撞,则在碰撞过程中对细杆与小球这一系统

水平转台上距转轴r处有一质量为m的物体随转台作匀速圆周运动。已知物体与台面间的静摩擦因数为m,若物体与转台间无相对滑动,则物体的转动动能为

均匀细杆ab,长为 l ,质量为m,可以绕过a端的光滑固定水平轴在竖直平面内自由摆动,转动惯量为€ ml 2/3 。若杆从水平位置由静止开始下摆,当下摆了q 角时,b端速度的大小为

一个物体正在绕固定光滑轴自由转动,下列说法哪些是正确的

如图所示,一光滑细杆上端由光滑绞链固定,其上套着一个小环。这根杆绕竖直轴oo′匀角速转动,其上的小环沿杆下滑。小环下滑过程中,设小环、杆和地球系统的机械能为e,小环加杆系统对轴oo'的角动量为l,则以下说法中正确的是

几个力同时作用在一个具有光滑固定转轴的刚体上,如果这几个力的矢量和为零,则此刚体

一轻绳跨过一具有水平光滑轴、质量为m的定滑轮,绳的两端分别悬有质量为m1和m2的物体(m1< m2),如图所示。绳与轮之间无相对滑动。某时刻滑轮沿逆时针方向转动,则此状态下绳中张力的情况为

一定轴转动刚体对转轴的转动惯量j=3.0kg×m2 ,初态以角速度w0=6.0rad/s转动.现对物体加一恒定的制动力矩m= -12n×m。当物体的角速度减慢到w=2.0rad/s时,它已转过的角度为

一定滑轮质量为m、半径为r,将之视为质量均匀分布的圆盘。在滑轮的边缘绕一细绳,绳的下端挂一物体。绳的质量可以忽略且不能伸长,滑轮与轴间无摩擦。若物体下落的加速度为a,则绳中张力为

一直杆长为l ,质量可以忽略,可绕通过其一端的水平光滑轴在竖直平面内作定轴转动,杆的另一端固定着一质量为m的小球,如图所示.现将杆由水平位置无初转速地释放.则杆刚被释放时的角加速度 b0 =_______,杆与水平方向夹角为60°时的角加速度b =___________.

飞轮对其转轴的转动惯量为j,在t =0时角速度为w0.此后飞轮经历制动过程.若阻力矩m 的大小与角速度w 的平方成正比,比例系数为k (k为大于零的常量).则当w = w0 / 3时,飞轮的角加速度b= ______.从开始制动到w= w0 /3 所需的时间 t=____________.

which of the following statements is true about the tower of babel?ity.

when you meet a friend in the morning and say “吃早饭了吗” to him or her, what function of language are you using?

saussure's "langue" is simialr to chomsky's _______.

why do people like reading poems?

chomsky made the distinction between _______________.

as modern linguistics aims to describe and yze the language people actually use, and not to lay down rules for “correct” linguistic behavior, it is said to be ___________.

“i can refer to confucius even though he died 2000 years ago.” this shows that language has the design feature of __________.

by_______is meant the property of having two levels of structures, such that units of the primary level are composed of elements of the secondary level and each of the two levels has its own principles of organization.

when people use language to express attitudes, feelings and emotions, people are using the ____________function of language.

language is not only used to exchange information, it can also perform many other functions, such as to express emotions or to persuade others, etc.

_______studies the human speech organs and the way in which the speech sounds are produced.

how many types of syllables are mentioned in the lecture?

why is the example of george bernard shaw mentioned in the lecture?

what does “liaison” mean in phonetics?

which of the following is not r-linking?

which of the following makes an acceptable combination in english for the three letters b, s, u?

what is the proper way to pronounce the same sound linking, such as “kiss someone”?

how do we judge whether a sound is a vowel or a consonant?

which one is a closed syllable?

there are no principles or rules for the pronunciation of english words.

the speech organs you might use include 3 parts : nose, mouth, throat

there are in total______ vowels in english speech sounds. (numbers)

there are in total ______ consonants in english speech sounds. (numbers)

vowels can be ided into different catagories according to __________.

there are 5 triphthongs in english vowels.

the sound [a:] is an ______ back tense unrounded vowel.

the sound [i:] is a _____front tense unrounded vowel.

in phonetics, [p], [b] and [m] are called _________ sounds based on their place of articulation.

consonants, based on whether the vocal cords are vibrating in their production, can be classified into ________ consonants and voiceless consonants.

__________ is a voiced alveolar stop.

the sound /f/ is _________________.

the different phones which can represent a phoneme in different phonetic environments are called the ____ of that phoneme.

a phone is a phonetic unit that distinguishes meaning.

a phone is represented with “[]”, while a phoneme is represented with “//”.

a phone is a _____ unit, while a phoneme is a ______unit.

using the diacritics(标音符号), _____________ transcription captures as many aspects of a specific pronunciation as possible and makes very subtle distinctions between sounds.

english phonemes areided into vowels and consonants. the distinction between the two lies in the obstruction of __________.

vowel sounds can be differentiated by a number of factors: the position of tongue in the mouth, the openness of the mouth, the shape of the lips, and the length of the vowels.

phonology is concerned with particular speech sounds in daily life.

two allophones occur in different phonetic environments and they complement each other in distribution, so they are in_____ ______.

how many consonants can the coda of a syllable contain?

“sea”is an open syllable.

the more prominent syllable is called a___syllable.

what does the word "whodunit" mean?

which branch of linguistics studies the internal structure of words and the rules by which words are formed?

which morpheme is not a bound one?

which affix is not an inflectional affix?

which morphemes are bound?

a root is the basic unchangeable part of a word, and it conveys the main meaning of the word. roots are always free.

which type of words expresses grammatical meanings?

which type of words has new members?

the allest meaning-bearing unit is a morpheme. how many morphemes are there in the word sunshine?

a derivational affix serves to derive a new word when it is added to another morpheme.

what is the term referring to words having more than one meaning?

in english, words usually have more than one meaning. there is no word which has only one meaning.

which language made the greatest impact upon the changes of english spelling?

what is the flemish way of english spelling?

which of the following words is formed by affixation?

which of the following words is formed by compounding?

which of the following words is formed by affixation?

which words are formed by blending?

which types of word forms become shorter?

the way to join two separate words to produce a single form is called compounding.

back-formation is an unusually abnormal type of word-formation where a shorter word is derived by deleting an imagined affix from a longer form already in the language.

how many reasons are mentioned for words having more than one meaning?

which of the following is not influenced by its etymology?

which of the following statements is not true about the word “ball”?

which is not the factor influencing the changes of english spelling?

all letters were pronounced in old english.

all polysemy words have only one central or basic meaning.

what does the example “is everyone here” try to tell us?

in the example, the coach said “we didn’t play well today”. what is implied? it means “ .”

which of the following is not implied in “i haven’t eaten breakfast”?

what is the difference between “i didn’t eat breakfast” and “i haven’t eaten breakfast”?

what is implied in “i am writing a book”?

which of the following is grammatically correct but sounds strange?

“michael broke the window.” is more about what michael did, and “the window was broken by michael.” is more about what happened to the window.

which of the two sentences sounds more natural? a. if you play football on the road, a car may hit you. b. if you play football on the road, you may be hit by a car.

what is the major way to express tenses in english?

the present tense does not only mean what is true now. it can also refer to events in the past and the future.

the meaning of a sentence remains the same when it is changed from the active voice to the passive voice.

which of the two sentences sounds more natural? _____. a. you didn't receive the check? they must have delayed it in the mail. b. you didn't receive the check? it must have been delayed in the mail.

"politician" and "statean" differ in ______.

______ is the study of the linguistic meaning of words and sentences.

the absence of a word in a particular place in a lexical field is called _______.

the relationship between "tulip / flower" is ______.

the relationship between "married / single" is ______.

i bought some roses " ______ " i bought some flowers.

"can i borrow your bike?" ______ "you have a bike."

________ refers to the relation between a pair of sentences, in which the truth of the second sentence necessarily follows from both the truth and falsity of the first sentence.

what are language resources?

isolated sounds or letters do not have meaning.

what does “you are such a good friend!” mean?

what is pragmatics?

which of the following verbs is not often used in presupposition?

from this lesson, how many ways do people use language to serve their purposes?

which of the following sounds most polite?

when expressing meaning, we don’t just use language, we need additional information. match the term with its explanation. information about the speaker and hearer.

when expressing meaning, we don’t just use language, we need additional information. match the term with its explanation. information about the purpose.

_____ deals with how meaning was used and negotiated in the context.

_____ studies meaning isolated from context.

________is the act of speaker’s intention.

________is the effect of the utterance on the hearer.

sentences in which there is a miatch between the form and function are called _______.

there are basically 3 different sentence types:

(a): professor john’s lecture is so boring. (b): what a nice day! let’s go for a picnic. which maxim does (b) flout?

(a)-how did jimmy do his history exam? (b)-not very well. teachers asked him things that happened before he was born. which maxim does (b) flout?

whenever there is a direct relationship between a structure and a function, we have a direct speech act

according to grice, conversational implicature occurs when a maxim of cooperative principle is flouted.

chomsky put forward the cooperative principle.

the sentence structure is ________.

which of the following is not included in the three classes of syntactic relations?

morphology focus on the structure and ordering of components within a sentence.

the structural approach was started by the swiss linguist saussure.

which of the following is not included in the three classes of syntactic relations?

positional relations are also called _________.

relations of subsitutability are also called ___________.

immediate constituents analysis is a way to diantle a grammatical construction in________ .

when language is used for establishing an atmosphere or maintaining social contact rather than for exchanging information or ideas, it serves a(n) _____ function.

in systemic functional grammar, three functions are_________.

in a clause, old information is called theme, while new information is called rheme.

immediate constituent ysis is the approach to ide the sentence into its immediate constituents by using binary cutting until obtaining its allest grammatical units.

ic ysis stands for image constituent ysis

________ construction is one whose distribution is functionally equivalent to that of one or more of its constituents, i.e., a word or a group of words, which serves as a definable centre or head.

the syntactic constructions can be ided into ______________.

how many tree diagrams could be used to yze the structure of sentence?

the play pygmalion was named after a greek myth.

chinese dialects differ in their_____.

the so-called internet hot words, or web buzzwords, can be viewed as part of a(n) ______.

what was the case of labov mentioned for?

dialects not only indicate _______difference but also suggest________ gaps in language.

non-standard language refers to the variety of a language assigned with the highest status in a country or state.

regional dialect is a variety of a language spoken in a specific geographic area.

in which of the following countries is english not used as an official language?

the language difference between england and scotland is called .

there is no absolute standard english.

in general, ____ speakers tend to use less hedges and tag questioms than their ____ counterparts with the same social background.

man interrupt more often to gain a floor than women.

in written, three most common language registers are________

halliday proposes three dimensions of ysis, they are ________

how many versions does sapir-whorf hypothesis have?

we can think while remaining conscious of our thinking process.

the reasom why there is only one word for camel in english while more than 400 words for camel in arabic is that our life environment influnces our language.

language influences how we perceive the things around us.

contemporary psycholinguistics mainly deals with such issues as______.

logically, language production contains three major steps: conceptualization, formulation, and_______.

formulation could be further ided into_______ and ________.

we don’t only perceive the things. what else do we also perceive?

which of the following scholars holds the view that "language system forms thought"?

according to lakoff and johnson, which of the following statements is not true?

how many metaphors are there in the sentence “my mother was a magician at stretching a dollar”?

tom is like a lion. 属于“明喻”。

chinese students often make some translation mistakes in english because of their different ways of metaphorical cognition.

audilingual teaching method stems from the behaviorist perspective.

对比分析的语言学基础为结构主义语言学,代表人物为bloomfield等

for behaviorists, children learn their first language through ___.

加拿大学者george siemens和stephen downes开设了第一门真正的mooc课程:connectivi and connective knowledge online course(cck08)。mooc这一词最早被提出是在哪一年

哪一年是国际公认的mooc元年

下列是数字原生代的学习者特征的是

下列哪些是spoc的特征

mooc是哪几个单词的缩写(作答时单词之间请用一个空格隔开)

spoc是哪几个单词的缩写

国际三大慕课平台分别为(作答时单词之间请用一个空格隔开)

大数据时代,数据使用的关键是

大数据的起源是

一般认为下列哪一年是“大数据元年”

下列关于计算机存储容量单位换算关系的公式中,错误的是

下列关与大数据描述错误的是

大数据的最显著特征是

以下哪项不是教育大数据的独特性的特点

下列是结构化数据的有

大数据的价值体现在

教育大数据驱动教育评价体系重构体现在

“人工智能”首次提出是在( )年

ai的英文缩写是( )

教育部首次印发文件在中小学课程设置人工智能课程是哪一年( )

人工智能应用研究的两个最重要最广泛领域为( )

下列描述不属于虚拟现实特征的是( )

6. 下列关于增强现实的描述不正确的是( )

虚拟现实技术应该具备的三个典型特征是(作答时每个词之间请用一个空格隔开)

aied是人工智能+教育缩写,其英文全称为(作答时每个单词之间请用一个空格隔开)

云计算就是把计算机资源都放到( )上

云计算是对( )技术的发展和运用

与网格计算相比,不属于云计算特征的是( )

比特币是谁发明的?( )

下列对比特币描述不正确的有( )

以下哪个不是区块链特性( )

对于数字货币拥有者来说,最重要是保护好自己的( )?

8、区块链分布式数据处理流程是( ) ①全网广播 ②创建新交易 ③交易写入各节点账本 ④交易验证并传播结果

下列是云计算特征的有

下列是云计算对教育价值的是

在物联网、云计算、大数据等信息技术的支持下智慧校园孕育而生,请简述你对智慧校园的理解以及智慧校园对教育教学的意义。

区块链是一种极具发展潜力的新兴技术,对未来教育的发展具有重要的价值,简述区块链的概念、特征,分享一个你知道的区块链教育应用案例。

人工智能对教育生态带来了巨大的冲击,请分别从人才培养目标、教育教学模式、教师角色等方面阐述人工智能对教育的影响。

大数据是信息技术最新发展成果的典型代表,它对教育产生了巨大的影响,请分别从教与学方式、教学评价、教学管理等方面分析大数据对教育的价值和影响。

part i: choose from the following groups of words the one you hear. each of the words will be read once only.

choose from the following groups of words the one you hear. each of the words will be read once only.

choose from the following groups of words the one you hear. each of the words will be read once only.

choose from the following groups of words the one you hear. each of the words will be read once only.

choose from the following groups of words the one you hear. each of the words will be read once only.

choose from the following groups of words the one you hear. each of the words will be read once only.

choose from the following groups of words the one you hear. each of the words will be read once only.

choose from the following groups of words the one you hear. each of the words will be read once only.

choose from the following groups of words the one you hear. each of the words will be read once only.

choose from the following groups of words the one you hear. each of the words will be read once only.

part ii: the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

part iii: the following pairs of sentences are exactly the same, except a different word is stressed (stronger) in each sentence. choose the sentences you hear in each group.

the following pairs of sentences are exactly the same, except a different word is stressed (stronger) in each sentence. choose the sentences you hear in each group.

the following pairs of sentences are exactly the same, except a different word is stressed (stronger) in each sentence. choose the sentences you hear in each group.

the following pairs of sentences are exactly the same, except a different word is stressed (stronger) in each sentence. choose the sentences you hear in each group.

the following pairs of sentences are exactly the same, except a different word is stressed (stronger) in each sentence. choose the sentences you hear in each group.

part iv: listening comprehension: in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

corporate culture corporate culture is described as the (1) _____________ of an organization, and guides how employees think, act, and feel.

it includes core values and beliefs, corporate ethics, and rules of behavior. it can be expressed in the company’s mission (2) _____________ and other communications,

in the architectural style or interior (3) _____________ of offices, and in the titles given to various employees. corporate culture affects you in many ways.

for instance: l the (4) __________ __________ per day, per week.

the (5) __________ __________, including employee interaction, competition degree, etc.

the (6) __________ __________, including the accepted styles of attire, etc.

the (7) __________ __________ you get, including cubicles, window offices, etc.

the (8) __________ __________ development.

onsite perks, such as break room, play room, etc. l the (9) __________ __________ outside the office.

(10) _____________ with other employers.

part ii. passage (shadowing and gist) directions: listen to the passage and choose the best answer to each of the following questions. what does the speaker really describe in the speech?

irections: listen to the passage and choose the best answer to each of the following questions. how do specialists comment on this study method?

directions: listen to the passage and choose the best answer to each of the following questions. how effectively can the average person learn during sleep as in the same period during the day?

directions: listen to the passage and choose the best answer to each of the following questions. what does sleep-teaching do?

directions: listen to the passage and choose the best answer to each of the following questions. what did the student have to do for another three hours before having breakfast?

part iii. news (shadowing and gist) a. directions: listen to the news item and complete the following summary. this news item is about .

directions: listen to the news item and choose the best answer to complete the following sentences. opposition parties are demanding after a violent protest over voting problems tuesday.

there were at least killed and injured during the voting.

people at more than 100 voting places .

show the ruling general people’s congress party in the lead.

part i (note-taking) directions: listen to a talk about light and health. take notes and complete the following summary. can light affect your health? many researchers believe that light can affect both your physical and your (1) .

from daylight, our bodies absorb vitamin d through the skin. certain skin diseases also (2) from exposure to sunlight.

light absorbed through the eye can stimulate hormone production, which in turn (3) our mood.

some people become (4) in winter, when the days are dark and most people spend less time in the open air.

when spring comes, these (5) disappear. researchers have called this condition sad -- seasonal affective depression.

the condition can be (6) by exposing patients to special lights, known as full-spectrum lights.

this lighting has also been used to treat patients (7) from jet-lag, to improve learning in school-children in russia and america,

and the (8) of japanese factory workers

young people need at least fifteen minutes a day in real daylight in summer (9) in winter.

old people, who risk vitamin d deficiency, should spend even longer exposed to (10) daylight.

peak performances - moments when children (1) that's in them -

are the stuff of every parent's (2) .

and yet most of us have seen a report card or heard a trumpet solo that (3)

what our kids can (4) .

why can some boys and girls repeatedly pull themselves to the (5)

while others of equal or (6) cannot?

many parents assume skill is pretty much determined by (7)

the student with the highest i.q. will get the best grades, or the athlete with the most prowess will (8) .

genes (9) in determining performance, but they're not everything.

the edge comes from mental attitude, character and (10) .

there are some simple ways for parents to help their youngsters develop those (11)

find something to praise. a child who feels good about himself (12)

assess your child's (13)

encourage self-applause. knowing how to relax is key to (14) .

a good report card (15) near your daughter's mirror reminds

her that she can do well and (16) to repeat her success.

there are no (17) to bringing your child to do his best.

it's a (18) of support, encouragement and hard work.

and those efforts (19) not only in peak performance

not only in peak performance but also in (20) between parent and child.

news item from voa, bbc and cri part i directions: listen to the news item and complete the following passage. creating a classroom environment that treats women and men equally is important for the educational success of students. however ____1______ equality does not stop with the teacher.

it is also important that the ____2______ used are supporting _____3_____ treatment.

in fact, many classroom materials, especially those that are older, may contain gender bias in _____4_____, photos, or words.

these materials can include textbooks, _____5_____, reading materials, written assignments, or even test materials.

having students use materials like these in class can reinforce _____6_____ about gender roles in society.

classroom materials that reinforce gender stereotypes can ____7______ students,

weaken their motivation and limit their overall _____8_____ performance.

this can result in fewer opportunities available to students when they finish their schooling. research has found that stereotypes and gender bias in english language materials do _____9_____.

several studies by the united nations educational, scientific, and cultural organization, or unesco, have found that some texts ____10______ women, contain stereotypes about women or offensive comments about women.

in addition, research has found that _____11_____ in teaching materials

often show a male _____12_____.

one study on high school english language textbooks in iran found that male characterizations were used as much as _____13_____ of the time.

one study on high school english language textbooks in iran found that male characterizations were used as much as _____13_____ % of the time.(请填写数字)

the first step is to understand how to identify gender bias in textbooks. examine the image below. these images were taken from an english language textbook. what do you notice about how the men and women are being _____14_____?

in this image there are six people, four men and two women, shown in different jobs. the men pictured include a construction worker, a doctor, a police officer, and a truck driver. the women shown include a farm worker and a food store employee. this image shows men and women in _____15____ jobs in two ways.

first, male representation is double that of female. second, the men generally are working in higher-level, more economically powerful jobs. now look at a short reading activity from an actual english language textbook. what do you notice about the ________ of men and women in the example?

part ii directions: listen to the news item and complete the following passage. a new report says about ___1__ people

a day have been forced to __2__ their homes in african conflict

and __3__ zones.

figures show that more than __4__ people in africa are internally displaced. (请填文字)

nearly __5___left their homes last year.(请填文字)

part iii directions: listen to the news item and complete the following passage. britain's most prestigious ___1___art award,

the turner prize have been won by an art professor who was born in zanzibar, lubaina himid. judges __2___ her work

which explored the african diaspora and black ___3__.

professor himid is the first black woman and the oldest person to win the__4__.

part i listening to a song directions: listen and fill in the blanks with the missing information. although (1) __________ has always been a friend of mine.

i'm leaving my life in your (2) __________.

people say i'm (3) __________

and that i am (4) __________.

risking it (5) __________ in a glance. 

how you got me blind is still a (6) __________.

i can't get you out of my (7) __________

don't care what is written in your (8) __________.

as long as you're (9) __________ with me. i don't care who you are. where you're from. what you did.

why did mr. power ask mr. hanson to call later?

why should the report be photocopied in the morning?

why was mr. power especially displeased about miss davis’s call to her boyfriend?

what do you think of miss wright?

what can you learn from the dialogue?

(dialogue 2:6-10)why has laura come to the office?

who is miss davis?

when do people in the finance section start work?

what do you know about linda?

why does linda feel a little nervous today?

(dialogue 3:11-15) why did the woman come to complain to the manager?

what excuse did the manager make for the problems?

what did the manager promise to do?

what do you know abut the hotel?

what does the dialogue mainly tell us?

part ii passages directions: you're going to hear three short passages. each will be read twice. at the end of each passage, you will hear some questions. choose the best answer to each question. (2 points for each) passage 1 which of the following is true according to the passage?

which of the following would be the best title for the passage?

passage 2 (18-20)why did the artly dressed man come to the jewelry shop one day?

which of the following was of no importance to the man?

what did the old lady take to the jewelry shop?

how much did the shop lose in the deal?

passage 3 (22-25) which of the following is not necessary for a young man who wants to drive alone?

what must a person do in the driving test?

which of the following is mentioned in the passage?

what is this passage mainly about?

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