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写出单词:拓扑____.

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写出单词:以太网____.

写出词组:维护成本____.

The network includes the network operating system in the client and server machines, the cables connecting them and all supporting hardware in between such as bridges, routers and switches. ( )

A. 对
B. 错

A local area network(LAN) is restricted by distances of up to 60 miles.

A. 对
B. 错

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