题目内容

Two ___died of cold last winter.

A. hundreds old people
B. hundred old people
C. hundred old peoples
D. hundred old peoples ('88MET.15)

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It is not rare in ___that people in ____fifties are going to university for further education.

A. 90s,the
B. the 90s, /
C. 90s, their
D. the 90s, their ('99上海 6)

-Have you seen many sheep in the distance ? -Yes, ___.

A. thousand of them
B. two thousands of them
C. two thousand of them
D. two thousand them

刚体的转动惯量是刚体转动惯性的量度,与下列哪一项无关:

A. 刚体质量
B. 刚体转动快慢
C. 转轴位置
D. 质量分布

关于力矩有以下几种说法:(1)对某个定轴而言,内力矩不会改变刚体的角加速度。(2)作用力和反作用力对同一轴的力矩之和必为零。(3)质量相等,形状和大小不同的两个刚体,在相同力矩作用下,它们的角速度一定相等。

A. 只有(2)是正确的。
B. (1)、(2)是正确的。
C. (2)、(3)是正确的。
D. (1)、(2)、(3)是正确的。

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