题目内容

[音频]

A. 10 minutes.
B. 15 minutes.
C. 20 minutes.
D. 25 minutes.

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[音频]

A. How to play football.
B. Which sport is better.
C. The man’s hobby.
D. The difficulty the man has.

[音频]

A. Near the first traffic lights.
B. On the left of the department store.
C. On the right of the department store.
D. In front of the department store.

一个力对这个力作用线上某一点的力矩总是等于0。

A. 对
B. 错

力矩的正负号表示力矩的转向。

A. 对
B. 错

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