单选题:当闭路电视电缆与其它线路共沟(隧道)敷设时,与220V交流供电线的最小间距是(  )mm。

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题目内容:
当闭路电视电缆与其它线路共沟(隧道)敷设时,与220V交流供电线的最小间距是(  )mm。 A.100
B.200
C.300
D.500

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答案解析:

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