单项选择题
低压架空线最大弧垂时,对不通航河或湖最高水位时距离不小于:()
A.2—3m
B.3—4m
C.4.5—5m
D.0.5—1m
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单项选择题
220v接户线在通讯线路上方,与通讯线路交叉时,其垂直距离不应小于:()
A.300mm
B.400mm
C.500mm
D.600mm
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单项选择题
低压接户线与树枝最小净空距离不应小于:()
A.100mm
B.400mm
C.300mm
D.500mm
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