ITU-R REPORT BT 1080-1-1990 International exchange of television programmes with data-encoded captions (sub-titles)《带有数码标题国际电视节目的交换(副标题)》.pdf

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ITU-R RAPPORT M 766-2 FRENCH-1990 Feasibility of frequency sharing between the GPS and other services《全球定位系统和其他服务之间的频率共享的可行性》.pdf

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