单项选择题
A.35m B.25m C.15m D.10m
A.1.30 B.1.20 C.1.11 D.1.10
A.30m B.20m C.15m D.10m
A.铜芯 B.聚乙烯 C.纸绝缘 D.交联聚乙烯
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