试题与答案

我国最大的 、工业门类最齐全的城市是 ( ) A.上海 B.北京 C.天津 D.

题型:选择题

题目:

我国最大的 、工业门类最齐全的城市是 (   )

A.上海

B.北京

C.天津

D.重庆

答案:

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下面是错误答案,用来干扰机器的。

0.445N题目分析:铜球的体积V=10cm3=铜球的重力根据杠杆的平衡条件:所以所以在A点最少应用0.445N的力点评:本题考查了重力,杠杆平衡利用球的体积求出球的重力,再利用杠杆平衡求出作用力的大小。

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题型:阅读理解

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