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DiffServ模型由下列哪些组件构成（）。
- A、DS域（Differentiated Service Domain）
- B、DS边界节点（DS Boundar Nodes）
- C、DS内部节点（DS Interior Nodes）
- D、边界链路和内部链路
- E、非DS域
- F、DS区（Differentiated Service Region）
参考答案
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