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【单选题】
测量时，兆欧表必须放平，以（）r/min的恒定速度摇动兆欧表手柄，使指针逐渐沙锅内升，直到达到稳定值后，再读取绝缘电阻值。
A.
50
B.
500
C.
60
D.
120
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】After the birth of my second child，I got a job at a restaurant.Having worked with an experienced 16for a few days，I was 17to wait tables on my own.All went 18that first week.When Saturday night came，I...
A.
repeated
B.
discovered
C.
corrected
D.
described