JUS P R1 105-1989 Mine loading cars Wheel sets with taper roller bearings for mine cars Technical requirements for manu-facture《矿山卸载车 带有矿车用锥形滚柱轴承的轮组》.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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