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【单选题】
同一建筑物内的低压系统工作接地、电气装置外露可导电部分的保护接地及防雷保护接地共用同一接地装置时,接地装置接地电阻最大允许值
A.
三者的最大值
B.
三者的最小值
C.
三者的平均值
D.
无法确定
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