NEN 6108-1984 Safety of household and similar electrical appliances - Particular requirements for electric shavers hair clippers and similar appliances《家用和类似用途电器的安全 电动剃须刀，电推刀及类似电器的.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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