多项选择题
A.交流电压 B.直流电压 C.线包电阻 D.电缆对地绝缘
A.900mm B.980mm C.1080mm D.1600mm
A.4mm B.5mm C.6mm D.8mm
A.引接线 B.接续线 C.道岔跳线 D.箱盒内部配线
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