ONORM M 7870-1982 Hoses without protective cover for acetylene for oxygene and other not combustible gases for gas welding cutting and allied processes 《用于乙炔,氧气和其他的不可燃气体的,用于气体焊接,切割.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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