ITU-R INFORME BT 1212 SPANISH-1990 Measurements and test signals for digitally encoded colour television signals《数字编码彩色电视信号的测量和测试信号》.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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