Many PAHs are carcinogenic or are suspected to be carcinogenic.其主要来源于煤的不完全燃烧,也有相当部分来源于汽车尾气的排放.The both carcinogenic factors were investigated on its dose - response ralationships.研究上述两种致癌因子的剂量 - 效应相关模式.Some industrial ch...
Finally, It'shows an application example of aerofoil missile.最后给出了有翼导弹模块系统的应用实例.With use of this structure model, we can simulate the real performance of aerofoil very well.应用该结构模型可以很好的模拟机翼结构的实际情况.Three kinds of fan...
The argument contained herein takes exactly the opposite point of view.本文所持的论点恰恰是站在相反的立场。A string of five rowing boats set out from the opposite bank.5只划艇排成一行从对岸出发了。St Andrews was ten miles in the opposite direction.圣安德鲁...