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If a backup is expired， which of the following is true？（）  
A: It can never be used for a restore/recover operation.
B: Oracle will remove the backup set pieces from the flash recovery area.
C: The backup has been used at least once to restore and recover the database.
D: The backup is no longer valid because of a resetlogs operation.
E: The physical backup set pieces are missing from the media.

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出自：Oracle认证

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