【单选题】
当不知道被测电流的大致数值时,应该先使用___量程的电流表试测。
A. 较小
B. 中间
C. 较大
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答案
C
解析
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C. 将电位探针插在离接地体20m的地下,电流探针插在离电位探针40m的地下
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