TCVN 7384-1-2010 Safety of machinery Safety-related parts of control systems Part 1 General principles for design《机械安全 控制系统的安全相关部件 第1部分 设计的一般原则》.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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