题目内容

She ______ the door before she goes away.

A. had locked
B. is locking
C. has locked.
D. was locking.

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解析法求解平面汇交力系的平衡问题，需要对力求投影。

A. 对
B. 错

如果一个力在某轴上的正交分力与坐标轴的指向相同，那么这个力在该轴的投影就为正。

A. 对
B. 错

After a while an agreement _____.

A. was arrived at
B. was arrived in
C. was arrived
D. has been arrived

I _____ that he would be able to leave tomorrow, but it's beginning to look diffcult.

A. hope
B. had hoped
C. hoped
D. am hoping