单项选择题
A.0.2m B.0.5m C.1.0m D.1.5m
A.10mm B.20mm C.50mm D.100mm
A.>25mm B.不小于电缆外径的4倍 C.不小于电缆外径的8倍 D.不小于电缆外径的10倍
A.300mm B.500mm C.1000mm D.1200mm
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