17. Why should you write a leave letter as early as possible?To allow your employer to__________________for your leave.
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18.What should you be specific about in your leave letter?You should be as specific as you can about the_______________.
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