【单选题】This question is so hard that students can work it out. [ ]
【单选题】WINDOWS 7提供了一些网络使用工具程序,其中有一个是专门用来测试网络是否连通的程序,它是__________。【考试题库】
【单选题】力系简化时若取不同的简化中心,则有( )。
D.
力系的主矢、主矩都不会改变,力系简化时与简化中心无关
【单选题】The question is too difficult. _____ students can answer it. [ ]
【单选题】The problem is so difficult that ______ students can work it out. [ ]
【单选题】_______students can work out the math problem,it is too hard.