题目内容

当力的作用线经过转轴时,因为力臂为零,所以力矩为零。

A. 对
B. 错

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当力与刚体转轴平行时,可以对刚体的转轴产生力矩。

A. 对
B. 错

刚体转动的角速度很大,那么刚体受到的力矩也很大。

A. 对
B. 错

Which of the following is a statistic that can be used to test hypotheses about a single population parameter?

A. F statistic
B. t statistic
C. χ2 statistic
Durbin Watson statistic

Which of the following tools is used to test multiple linear restrictions?

A. t test
B. z test
C. F test
D. Unit root test

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