[音频]
A. 10 minutes.
B. 15 minutes.
C. 20 minutes.
D. 25 minutes.
[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