單項(xiàng)選擇題當(dāng)?shù)蛪郝銕щ婓w采用板狀遮護(hù)物時,裸帶電體與遮護(hù)物之間的凈距,不應(yīng)小于()

A.20mm
B.50mm
C.100mm
D.125mm


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