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写出单词:以太网____.
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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 local area network(LAN) is restricted by distances of up to 60 miles.
A metropolitan area network(MAN) is restricted to distances of up to 60 miles.
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