NF E48-652-1990 Hydraulic fluid power Fluids Determination of overall particulate contamination by the gravimetric method 《液压流体动力 流体 用重量法测定颗粒总污染度》.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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