HD 483 15 S2-1990 Sound System Equipment Part 15 Preferred Matching Values for the Interconnection of Sound System Components《音响系统设备 第15部分 声系统设备互连的优选配接阀门》.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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