文件名称:lesson4
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通信建立过程和需要的主要信道
建立和维持通信链路所需的技术
-Communications building process and the need for a major channel to establish and maintain communication links required technical
建立和维持通信链路所需的技术
-Communications building process and the need for a major channel to establish and maintain communication links required technical
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lesson4.ppt