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... PTV Pay Television 付费电视 Public Packet Switched Network 公共包交换网络 Public switched telephone network (PSTN) 公用电话交换网 ...
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PPSNPublicPacketSwitchedNetwork
公共包交换网络 public packet switched network ; PPSNPublicPacketSwitchedNetwork 电文交换网络 message switching network 报文分组交换网络 packet switching network ..
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