SIS SS 2154-1990 ISO system of limits and fits ISO tolerances y6toy10 for shafts《ISO限制和配合体系 ISO轴公差y6-y10》.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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