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In which scenario will you perform a cancel-based recovery？（）
A: when a tablespace is dropped and you have only RMAN-based backup of the database
B: when a table is dropped and stored in the Recycle Bin
C: when you are required to recover an existing table to its previous state
D: when a tablespace is dropped and you have only a user-managed full backup of the database

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出自：Oracle认证

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