JUS N A8 302-1990 Ceramic and glass insulating materials for electrical purposes Requirements for individua! materials《陶瓷和玻璃电气绝缘材料 单独材料的要求》.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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