SIS SS-ISO 888-1986 Bolts screws and studs - Nominal lengths and thread lengths for general purpose bolts《螺栓，螺钉和螺栓 标称长度及一般用途的螺栓的线长度》.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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