NF F19-503-1989 Railway rolling stock Tests method of greases for axle-boxes to rolling bearings Dynamic test for stability to oxydation of grease 《铁路车辆 轴箱与滚动轴承用的油脂试验方法 油脂氧化稳定性的动态试.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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