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Within a resource-plan definition， what differentiates a top-level plan from a subplan？（）  
A: A subplan has the PLAN_SUB parameter value set to SUB
B: A top-level plan has the GROUP_OR_PLAN parameter set to the name of the subplan in the resource-plan definition
C: There is no difference in the resource-plan definition
D: A subplan always has the CPU_MTH parameter value set to RATIO
E: The string TOP_LEVEL is appended to the name of top-level resource plans

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出自：Oracle认证

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