SIS SS-EN 161-1991 Automatic shut-off valves for gas burners and gas appliances《具有自动关闭阀门的煤气燃烧器和燃气用具》.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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