(2018年真题)4根单芯截面为6mm2的导线应穿钢管直径为()A.15mm

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问题 (2018年真题)4根单芯截面为6mm2的导线应穿钢管直径为()A.15mmB.20mmC.25mmD.32mm

选项 A.15mm
B.20mm
C.25mm
D.32mm

答案 B

解析
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