as for the sliding pair in a planar mechani, the location of instant center is located at ______________.
determine the type of the linkage and type of the two side links ab and dc (crank or rocker) according to the grash of criterion. the coupler bc rotates 360° with respect to the frame. lab = 45mm, lbc = 50mm, ldc = 60mm, lad = 20mm
药品飞行检查可以针对的环节包括：（多选题）
almost all machines contain only one basic mechani.
mechanis used in machines which have different functions and profiles may be the same.
下面所列各种制动方式中，属于黏着制动的有
the cam mechani below has the dimensions: r=50mm, loa=20mm,lac=80mm, j1=90 degree. cam 1 rotates at a constant angular velocity of w1 = 10 rad/s. counterclockwise. p12 is an instant center. the angular velocity w2 of follower 2 is equal to:
标准局于上个世纪___年代公布的des加密算法,是一种___密码算法。
a survey was conducted to determine how people rated the quality of programming available on television. respondents were asked to rate the overall quality from 0 (no quality at all) to 100 (extremely good quality). the stem-and-leaf display of the data is shown below. what percentage of the respondents rated overall television quality with a rating of 50 or below? stem leaves 3 2 3 4 0 3 4 7 8 9 9 9 5 0 1 1 2 3 4 5 6 1 2 5 6 6 7 0 1 8 9 2
gear mechanis can be used to tranit motion between ________.