NF E66-150-1990 Hand- An machine-operated circular screwing dies and hand-operated die stocks 《手控制和机器控制的圆形螺丝板牙和板牙架》.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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