SIS SS-ISO 9178-1-1990 Templates for lettering and symbols Part 1 General principles and identification markings《书写和符号模板 第1部分：一般原则和鉴定标识》.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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