题目内容

It is unusual for Americans and Britishmen to use first name early in a business relationship.

A. 对
B. 错

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It doesn't matter if you break certain social rules if it is clear that you are sensitive to other people.

A. 对
B. 错

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___________。