CNS 505-1978 ISO Metric Fine Screw Threads (Diameters from 42 to 300 mm and Pitch 4 mm)《公制细螺纹8（ISO制）（标称直径42至300公厘，螺距4公厘）》.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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