题目内容
电缆穿导管敷设时，正确的施工方法有（ ）D
2021-12-09
A.每一根管内只允许穿一根电缆
B.管道的内径是电缆外径的1.2〜1.4倍
C.单芯电缆不允许穿入钢管内
D.应有3%的排水坡度
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