ITU-R INFORME BT 1077-1 SPANISH-1990 Enhanced 4 3 aspect ratio television systems《增强的4 3的电视系统》.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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