题目内容

实验中易发生的安全事故有（）。

A. 爆炸和火灾
B. 危险化学品危害和触电事故
C. 生物安全危害和电离辐射危害
D. 交通事故和地震

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Which three statements are true about Flashback Database?（）

A. Flashback logs are written sequentially, and are archived.
B. Flashback Database uses a restored control file to recover a database.
C. The Oracle database automatically creates, deletes, and resides flashback logs in the Fast RecoveryArea.
D. Flashback Database can recover a database to the state that it was in before a reset logs operation.
E. Flashback Database can recover a data file that was dropped during the span of time of the flashback.
Flashback logs are used to restore to the blocks' before images, and then the redo data may be used to roll forward to the desired flashback time.

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