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She asked me to put my books in her office. I could find them quickly and easily there.改写where引导的定从。

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They showed us the place. They once lived and worked in that place.改写where 引导的定从

力只要和轴不垂直和不平行就一定会对轴产生力矩。

A. 对
B. 错

当力的作用线与转动轴共面的时候,力对轴不会产生矩。

A. 对
B. 错

空间一般力系有个平衡方程。