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Which three statements are true regarding the use of the Database Migration Assistant for Unicode(DMU)?（）
A:A DBA can check specific tables with the DMU
B:The database to be migrated must be opened read-only.
C:The release of the database to be converted can be any release since 9.2.0.8.
D:The DMU can report columns that are too long in the converted characterset.
E:The DMU can report columns that are not represented in the converted characterset.

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出自：Oracle认证

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