So the loop network-earthing device must be designed in combination with building characters and the earthing resistance can be estimated with a simplified formula.
其环网接地装置必须结合建筑物特点进行设计，接地电阻可用简化公式估算。
So the loop network-earthing device must be designed in combination with building characters and the earthing resistance can be estimated with a simplified formula.
其环网接地装置必须结合建筑物特点进行设计，接地电阻可用简化公式估算。
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