Which three operations require undo data（）

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• Which operations require undo data（）

  A . Committing a transaction B . Flashing back a transaction C . Recovering a failed transaction D . Running a read-consistent query E . Changing a tablespace status from READ ONLY to READ WRITE

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  A . asynchronous response mode （ARM） B . normal peer mode （NPM） C . asynchronous balanced mode （ABM） D . normal response mode （NRM） E . asynchronous client mode （ACM）

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• Which three service components are in the operate phase？（）

  A . System Monitoring B . Operations Implementation C . Incident and Problem Management D . Change Management E . Operations Plan F . Project Close Out

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• The famous surgeon underwent five______operations in three weeks.

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