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【单选题】
下列关于局域网的叙述，错误的是
A.
共享式以太网使用集线器作为中心连接设备
B.
交换式以太网使用交换机作为中心连接设备
C.
计算机从共享式以太网转入交换式以太网需更换网卡
D.
共享式以太网通常同一时刻只允许一对计算机通信
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