题目内容

动量是一个瞬时的量,冲量是在一段时间内累积的量。

A. 对
B. 错

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质量中心的速度是质量中心运动方程对时间的导数。

A. 对
B. 错

I wish I knew someonecould help me with my English.

That is the womanhouse is worth nearly 2 million pounds.

I saw a ladyI assumed was the manager of the shop.

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