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【单选题】
使用兆欧表时,下列做法不正确的是( )A.
测量电气设备绝缘电阻时，可以带电测量
B.
测量时兆欧表放在水平位置，未接线前先转动兆欧表做开路实验，看指针是否指在 “∞”处，再把 L 和 E 短接，轻摇发电机，看指针是否指“ 0 ”，开路为“∞”，短路指“ 0 ”，说明兆欧表是好的
C.
兆欧表测，应立即使被测物体放电
D.
测量时，摇动手柄的速度由慢逐渐加快，并保持 120r/min 的转速 1min 左右，这时读数较为准确。
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