SIS SS-ISO 8755-1989 Commercial road vehicles Mechanical connections between towing vehicles and trailers 40 mm drawbar coupling《商用道路车辆 牵引车与拖车之间的机械连接40毫米挂钩联结》.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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