Digital trunk mobile system is the advanced level of the special mobile communication, and it has attracted attention abroad.
数字集群移动通信系统作为专用移动通信的高级阶段，受到了广泛的关注。
Digital trunk mobile system is the advanced level of the special mobile communication, and it has attracted attention abroad.
数字集群移动通信系统作为专用移动通信的高级阶段，受到了广泛的关注。
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