力的平移定理，适合于（）。A．刚体 B．质点 C．变形体 D．钢材

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问题单项选择题

力的平移定理，适合于（）。

A．刚体

B．质点

C．变形体

D．钢材

答案

参考答案：A

选择题

He ________late watching TV when he was a student, but now he ________to bed early.

A．was used to staying up; is used to go

B．used to staying up; used to go

C．used to stay up; is used to going

D．used to stay up; used to go

单项选择题

He ______ so much work that he couldn’t really do it efficiently.

A. put on
B. brought on
C. took on

D. carried on