pttcn.net
中国集群通信网
集群通信咨讯,资料,技术,方案。----【集群通信、应急通信、指挥调度、应急联动、智慧城市、对讲机、数字集群、多媒体宽带集群、Tetra、GoTa、PDT、DMR、QChat、LTE】
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