TCVN 6447-1998 Electric cables-XLPE insulated Aerial bundled for working voltages up to 0 6KV《交联聚乙烯绝缘电缆 工作电压小于等于0 6KV的集束型架空电缆》.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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