信号设备防雷地线埋设在电阻率小于300Ω•m的土壤中时,接地电阻不大于()。A、1Ω

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问题:

信号设备防雷地线埋设在电阻率小于300Ω•m的土壤中时,接地电阻不大于()。

A、1Ω

B、10Ω

C、15Ω

D、20Ω

考点:信号工考试初级信号工初级信号工题库
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2.  I have a  ___________  throat and I have a fever.

3.  Try to relax.  Don't get ___________ out.

4.  The students won't go there by bus.  They will go on   ___________.

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6.  If you are  ___________. you can get some water to drink.

7.  Mr Green is  ___________ with her daughter because she doesn't study carefully.

8.  —I have a  ___________.

     —You should see a doctor.

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