单选:距接地体处的跨步电压变化距离()。A.10m以外为0;B.越接近接地处越大,越远则越小,20m远时为0;C.30m以外为0;D.5m以内最小

题目内容:
距接地体处的跨步电压变化距离()。
A.10m以外为0;
B.越接近接地处越大,越远则越小,20m远时为0;
C.30m以外为0;
D.5m以内最小。
参考答案:

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