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【单选题】
安全防范系统的接地母线应采用铜质线，接地电阻不得大于( )；建造在野外的安全防范系统，其接地电阻不得大于( )；在高山岩石的土壤电阻率大于2000Ω.m时，其接地电阻不得大于( )。
A.
4Ω,10Ω,20Ω
B.
4Ω,1Ω,10Ω
C.
4Ω,15Ω,15Ω
D.
4Ω,4Ω,25Ω
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举一反三
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