單項選擇題DL/T1424-2015《電網(wǎng)金屬技術(shù)監(jiān)督規(guī)程》中規(guī)定,GIS設(shè)備的接地連線材質(zhì)應(yīng)為電解銅,且緊固接地螺栓的直徑不小于()

A.8mm
B.12mm
C.16mm
D.20mm


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