NF L81-322-1978 Aircraft receptacles for hoisting devices Metric ISO thread profile and tolerances 《起重装置用飞机承座 米制ISO螺纹牙形和公差》.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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