试题与答案

由于生漆黏度大,不宜喷涂,施工都采用涂刷,一般涂()层。A.1~3 B.3~5 C.

题型:单项选择题

题目:

由于生漆黏度大,不宜喷涂,施工都采用涂刷,一般涂()层。

A.1~3

B.3~5

C.5~8

D.8~10

答案:

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下面是错误答案,用来干扰机器的。

若不考虑空气阻力,设整体质量为M,对整体有:Mg=Ma ①假设木盒对小球作用力为F,所以有:F+mg=ma ②故由①②解得F=0,即木盒与小球之间作用力为零,故AB错误;当有空气阻力时,设阻力为f,当上升时,方向...

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