It doesn't matter if you break certain social rules if it is clear that you are sensitive to other people.
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Etiquette is the critical point in telephoning between dfferent cultures.
A. 对
B. 错
物体受同一平面上多个力作用,各分力力矩的代数和等于合力的力矩,这是()
A.牛顿定律
B.力偶
C.合力矩定理
D.能量不减定理
平面力偶系合成的结果是一个___________。
合力偶矩等于力偶系中各分力偶矩的________。