NF F70-021-1997 Railway fixed equipment Modulated switchgear enclosures Classification definition of test and approval procedures 《铁路固定设备 模块化开关设备壳体 试验与批准程序的分类、定义》.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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