【单选题】T h ere are two hundred______i n our school .
【单选题】已知一对正确安装的标准渐开线圆柱齿轮传动,其压力角ɑ=,模数m=4mm,传动比i12=3,中心距a=144mm。则两齿轮的分度圆直径分别为
【单选题】辨音题 (T为划线部分发音相同,F为划线部分发音不同) h ear (划线部分:ear) wh ere (划线部分ere)
【单选题】T h ere is no doubt the company has made the right decision on the sales project.
【单选题】Han Han is one of writers, though some old writers don’t like him very much.