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Which statement is true when Automatic Workload Repository （AWR） baselines are created using baseline templates？（）  
A: AWR baselines are always created as repeating baselines.
B: AWR baselines can be created on the basis of two time values.
C: AWR baselines are always created with infinite expiration duration.
D: AWR baselines are always created using the Automatic Workload Repository （AWR） retention period as expiration duration.

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出自：Oracle认证

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