介绍一种简单实用的立方密积形成面心立方结构的教具制作和演示。

A self-fabricated teaching aid for cubic stacking is presented. The method of fabricating and demonstrating are reported.

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对于绝缘子下表面，风速一般对积污严重程度影响不大，但环境中污染物的成分对绝缘子盐密值影响较大。

For the lower surface, wind speed generally little effect on the severity of the contamination, but the composition of pollutants in the environment impact the insulator salt density greater.

youdao

对于绝缘子下表面，风速一般对积污严重程度影响不大，但环境中污染物的成分对绝缘子盐密值影响较大。

For the lower surface, wind speed generally little effect on the severity of the contamination, but the composition of pollutants in the environment impact the insulator salt density greater.

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