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Which two statements are true about the duplexing of the backups taken by RMAN？（）  
A: It’s only supported for the backups performed on the tape
B: It is not supported for backup operations that produce image copies
C: Duplex backups need a parallelism for the device to be equal to number of copies
D: Duplex backups can be performed to either disk or tape， but cannot be performed on tape and disk simultaneously

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出自：Oracle认证

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