题目内容

测量轴电压和在转动着的发电机上用电压表测量转子绝缘的工作，应使用专用电刷，电刷上应装有500mm以上的绝缘柄。

A. 正确
B. 错误

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You plan to execute the following command to perform a Flashback Database operation in your database： SQL> FLASHBACK DATABASE TO TIMESTAMP （SYSDATE -5/24）； Which two statements are true about this？（）

A. The database must have multiplexed redo log files
B. The database must be in the MOUNT state to execute the command
C. The database must be in the NOMOUNT state to execute the command
D. The database must be opened in RESTRICTED mode before this operation
E. The database must be opened with the RESETLOGS option after the flashback operatio

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