SIS SS-EN 10 207-1992 Steels for simple pressure vessels Technical delivery requirements for plates strips and bars《钢的简单压力容器 钢板，钢带和钢条的技术交付要求》.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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