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Which two statements are true about the WebLogic Cluster ？（）
A: Clustered Servers capacity can be increased by adding new server instance to the cluster on an existing machine
B: Clustered Servers can be on a same or different machine with same operating system only
C: Clustered Servers can only be on a same machine or different operating system
D: Clustered Servers can be on a same or different machine with same or different operating system

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出自：Oracle认证

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