The shortwave radiocommunication between Antarctica and Beij- ing is the longest link at present time in China.
南极北京是我国目前最长的短波通信线路之一。
Maritime navigation and radiocommunication equipment and systems - digital interfaces - part 2: single talker and multiple listeners, high - speed transmission.
海上导航和无线电通信设备及系统。数字接口。第2部分：高速传送的单个通话器和多个受话器。
Maritime navigation and radiocommunication equipment and systems - digital interfaces - part 2: single talker and multiple listeners, high - speed transmission.
海上导航和无线电通信设备及系统。数字接口。第2部分：高速传送的单个通话器和多个受话器。
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