gb3469-83《文献类型与文献载体代码》的规定以单字母方式标识各种参考文献类型,下面这条文献属于哪种文献类型?() weinstein l .digital filters and their applications[m]. londonengland academic press 1978p472-481
the position of an electron is known with accuracy . according to the approximate form of the uncertainty principle (δx⋅δp≈ℏ), the uncertainty in the electron's speed is on the order of
指出下列汉字是形声字或会意字,并分析结构 2)修 條
zero-point energy increases as the particle mass decreases.