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NDB山区地带的地网接地电阻应小于( )。
分类: 导航专业业务
发布时间: 2023-11-19 22:59
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NDB山区地带的地网接地电阻应小于( )。
A.A、3欧
B.B、1欧
C.C、4欧
D.D、2欧
正确答案是C
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