TCVN 5123-1990 Content of carbon in exhaust gases of automobiles with petrol engines Rates and methods of determination《带汽油发动机的汽车排放尾气中的碳含量 比率和测定方法》.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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