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Identify three situations in which you would NOT be able to drop a tablespace. （）
A:when the tablespace is online
B:when the tablespace has segments with data in it
C:when the tablespace is a default permanent tablespace for the database
D:when the tablespace contains a table that is currently being used by transactions
E:when the tablespace contains undo data that is needed to rollback an uncommitted transaction

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出自：Oracle认证

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