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：()

Rosenberg holds that public-health advocates shouldA．recruit professional advertisers.B．learn from advertisers' experience.C．stay away from commercial advertisers.D．recognize the limitations of advertisements. 点击查看答案

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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