NF F48-123-1992 Railway fixed equipment Modular power supply units for signalling equipment telecommunication equipment and computer equipment Battery cabinet 《铁路固定设备 信号传输设备、通信设备和计.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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