题目内容：
以太网的拓扑结构是（ ）。
A．星型 B．总线型
C．环型
D．树型
参考答案：
答案解析：
单选题：以太网的拓扑结构是（ ）。
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- 题目类型：单选题
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B．总线型
C．环型
D．树型
B．总线型
C．环型
D．树型
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