(59)下面关于局域网接入 Internet的叙述中,错误的是 A)局域网接入 Internet时,通常需要使用路由器 B)每个以太网卡有一个全球准一的 MAC 地址 C)PC可以使用非屏蔽双绞线连接到集线器或交换机 D)局域网中交换机的主要功能是用于扩大网络传输距离
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