SIS SS-IEC 546-1990 Process control Controllers with analogue signals foruse in industrial-process control systems《过程控制 工业过程控制系统中使用的带模拟信号控制器》.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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