NF F74-101-1-1993 Railway fixed equipment and rolling stock Safety cablework and connection Part 1 safe criterion 《铁路固定设备和机车车辆 安全铺设电缆和连接 第1部分 安全准则》.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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