JUS N G5 005-1990 Rotating electrical machines Classification of degrees of protection provided by enclosures for rota- ting machines《旋转电机 防护罩防护等级的分类》.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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