空气中所含的氮的比例是多少?What is the percentage of nitrogen in air?作物收获后, 他测定了作物中氮的含量.After harvesting the crops , he tested them for nitrogen content.不含碱性氮的化合物包括吡咯 、 吲哚 、 咔唑和苯咔唑.Non - basic nitrogen - containing series include pyr...
他似乎把负号误作正号了.He seems to have mistaken a minus for a plus.出现负号的原因与 33-2 节所讲的相同.The reason for the minus sign is the same as in Section 33 - 2 .这个负号表示这个力总是和速度的方向相反.The negative sign describes the fact that this is always o...
This is obviously due to the Compton and photoelectric effects.很明显,这是由于康普顿效应与光电效应作用的缘故.Moyer, from Essex, England, plays bloodsucking Bill Compton on the series.而39岁梅耶则是来英国艾塞克斯, 他在剧中扮演男主角 、 吸血鬼比尔·坎普顿.Compton scattering c...