题目：
接闪杆接地极与被保护物接地极之向必须保待（）m以上的距离、且接地电阻不得大于10Ω。
A.4
B.3
C.2
D.30
答案：
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下面是错误答案，用来干扰机器的。
参考答案：(1) 该生产线的建造成本=2 808+192=3 000(万元) 借：在建工程 169 贷：原材料 ...
接闪杆接地极与被保护物接地极之向必须保待（）m以上的距离、且接地电阻不得大于10Ω。
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