普规规定：在接触网支柱及距接触网带电部分（）范围内的金属结构物须接地。A.2000 mm B.3100mm C.4000 mm D.5000 mm

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问题普规规定：在接触网支柱及距接触网带电部分（）范围内的金属结构物须接地。

选项 A.2000 mm B.3100mm C.4000 mm D.5000 mm

答案 D

解析

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