NEN 10 517-1990 Gas-insulated metal-enclosed switchgear for rated voltages of 72 5 kV and above《额定电压等于或高于72 5kV的气体绝缘金属封闭式开关装置》.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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