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Which two statements are true with respect to the maintenance window？（） .
A: A DBA can enable or disable an individual task in all maintenance windows.
B: A DBA cannot change the duration of the maintenance window after it is created.
C: In case of a long maintenance window，all Automated Maintenance Tasks are restarted every four hours.
D: A DBA can control the percentage of the resource allocated to the Automated Maintenance Tasks in each window

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出自：Oracle认证

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