选择题:用兆欧表测量吸收比是测量()时绝缘电阻之比,当温度在10—30℃时吸收比为1.3—2.0时合格。

题目内容:
用兆欧表测量吸收比是测量()时绝缘电阻之比,当温度在10—30℃时吸收比为1.3—2.0时合格。

A.15S和60S
B.15S和45S
C.20S和70S;
D.不定
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