... system ground 系统接地 system grounding conductor 系统接地导体 system head 系统压头，系统阻力 ...
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When designing the system of the grading of the building, I define the level of grounding for lightening of the building. Then I design the lightning conductor of the roof and the ground wire.
在进行防雷接地设计时，先确定了其防雷等级，再对屋顶进行了避雷带的设计和负一层接地设计。
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