DS IEC 949-1990 Calculation of thermally permissible short-circuit currents taking into account non-adiabatic heating effects《在考虑非绝缘加热效应条件下的热容许短路电流的计算》.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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