TCVN 4797-1989 Friction muffs mechanically operated with magnetic contactor Nominal torsional moments《带电磁接触器的摩擦罩机械操作 标称扭矩》.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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