题目内容

A.He enjoys finding fault with exams. B.He is sure of his success in the exam.

A. He enjoys finding fault with exams.
B. He is sure of his success in the exam.
C. He doesnt know if he can do well in the exam.
D. He used to get straight As in the exams he took.

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A. 墨菲征阳性
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C. 库瓦西耶征阳性
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E. 库瓦西耶征阴性

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力螺旋是空间力系特有的最终简化结果。( )

空间力系之主矩是一个矢量,且该矢量一定与简化中心的选取有关。( )

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