ONORM ISO 3461 Teil 1-1990 General principles for the creation of graphical symbols graphical symbols for use on equipment《图形符号创建的一般原则 设备上使用的图形符号》.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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