题目内容

当质点的运动轨迹未知时不能用自然形式的运动微分方程。

A. 对
B. 错

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物体一旦受到几个力的作用,它一定要沿着这几个力合力的方向运动。

A. 对
B. 错

Doctors strongly recommend that fathers____(be) present at their baby’s birth.

If you____(follow) my advice to prepare well ahead, you wouldn’t have failed the exam.

The city would look more beautiful if people____(throw) rubbish on the streets.

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