NF C66-423-1986 Insulators and fittings for overhead lines Metal fittings Insulator pin Horizontal cross arm (BP) 《架空线路用绝缘子和连接件 金具水平横扣（BP）》.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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