十多年来，机要通信业务规范变化很大。
The standards of confidential communication business change greatly in the last ten years.
道路交通管理。交通信号灯控制器。功能规范。
Road traffic control . traffic signal controller. functional specifications.
道路交通管理。交通信号灯控制器。功能规范。
Road traffic control . traffic signal controller. functional specifications.
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