题目内容

算术平均数有哪些优点?

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为什么电动机外壳要接地?

为什么说“柔韧素质在散打训练中具有重要意义”?

The film of oil between the rings and the liner is not only essential for the lubrication but also plays an important part in achieving ().

A. an oil seal
B. removing heat
C. a gas seal
D. cooling the pisto

用百分表测圆柱时,测量杆应对准()。

A. 圆柱轴中心
B. 圆柱左端面
C. 圆柱右端面
D. 圆柱最下边

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