JUS C X5 025-1990 Magnetic materlals Preparation of specimens for the checking of quality and testing of magnetic properties《磁性材料 质量检验和磁性检测的样品制备》.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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