SIS SS-ISO 225-1986 Fasteners - Bolts screws studs and nuts - Symbols and designations of dimensions《紧固件 螺栓，螺钉，螺栓和螺帽 标志和指定尺寸》.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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