SIS SS-EN 60 967-1990 Safety of electrically heated bl nkets pads and similar flexible heating appliances for household use《家庭用电热毯、电热垫和类似柔性加热电器的安全性》.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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