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1.Cabletelevision/Digitalcamera。有线电视/数码相机2.Timedivisionmultiplexing/Timesharingsystem3.WideAreaNetwork/LocalAreaNetwork

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3。广域网/局域网   4。中心/路由器/交换机   5。开放系统互连网络拓扑/参考模型/拓扑   6。无线通信/带宽   7。点对点通信/异步传输