CNS 12491-9-1989 Graphical Symbols for Use on Electrical and Electronic Equipment (Recording Reproducing)《电机电子设备用图符号(记录 重现)》.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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