UNI 5377-1964 Railway rolling stock Gauges for controlling the profile of the external surface finished and unfinished of treads for wheels with inserted treads 《铁路车辆 用于嵌入轮辋车轮上的轮辋的.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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