星形拓扑，环形，树形和总线拓扑各自的特点是什么？
Star topology , ring , tree and bus topology what their characteristics?
在同一个网络中用于分配计算机的通用的拓扑结构有点对点，总线结构，星型结构和环形结构。
Common topologies used to arrange computers in a network are point-to point, bus, star, and ring.
星形结构在运行维护、传输时间等多方面优于总线型、环形结构，宜采用双星形结构构建过程层网络。
As star structure is superior over bus and ring structures in operational maintenance, transmission time and so on, dual-star structure is proposed for process level networking.
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