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问题 单项选择题 A1/A2型题

正常人的力平均为（）

A.22.4～68.3kg

B.12.4～58.3kg

C.33.4～68.3kg

D.44.4～68.3kg

E.10～23kg

答案

参考答案：A

填空题

有两颗人造地球卫星，它们的质量之比m1：m2=1：2，它们运行的线速度之比v1：v2=1：2．那么它们运行的周期之比为______，它们所受的向心力大小之比为______．
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选择题

I am ______ the government as well as to the general public for just treatment ______ peasant-workers,

who have made great contributions to the improvement of city life. [ ]

A. asking; on behalf of

B. applying; in the name of

C. demanding; in the name of

D. appealing to; on behalf of

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