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当前学科：电能计量检定考试
题目：
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对电能表检定装置进行绝缘强度试验时，选用额定电压为2kV的兆欧表测量绝缘电阻，电阻值应不小于（）。
A . 2MΩ
B . 5MΩ
C . 5kΩ
D . 2.5MΩ
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