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使用 ((num=数值1符号数值2))eg: ((num4=6/3))echo $num4

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使用 let num=数值1符号数值2eg: let num5=4%3echo $num5

力对点之矩在通过该点的任意轴上的投影,等于力对该轴之矩。

A. 对
B. 错

She and her family bicycle to work, _________ helps them keep fit.

Kae, _________sister I shared a room with when we were at college, has gone to work in Australia.A. whom B. thatC. whose D. her

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