ONORM K 2502-1986 Sound cam-er for the hearing test using words in accordance with NORM K 2530《按照NORMK2530的听力测试使用句子用声频载波》.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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