NEN 3624-1981 Rubber insulated cables for hoisting devices and transport systems (supplementary specifications to NEN 3622)《起重设备和运输系统的橡胶绝缘电缆（NEN 3622的补充规范）》.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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