SIS SS-ISO 2768-1-1990 General tolerances Part 1 Tolerances for linear and angular dimensions without individual tolerance indications《一般公差 第1部分：无单独公差指示的线性和角度尺寸公差》.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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