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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
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【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
相关题目：
【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
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