题目内容

18.What should you be specific about in your leave letter?You should be as specific as you can about the_______________.

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19.What should you be honest about with your boss?You should be honest about why you__________________.

20.What details may you include in your leave letter?You may suggest how your work will be______________.

平面任意力系，只要主矢大小不为零，最后必可简化为一个合力。

A. 对
B. 错

平面任意力系向某点简化之主矢为零，主矩不为零。则此力系可合成为一个合力偶，且此力系向任一点简化之主矩与简化中心的位置无关。

A. 对
B. 错