SIS SS-ISO 8012-1990 Compressors for the process industry Reciprocating types Specifications and data sheets for their design and construction《加工业用压缩机 往复式类型 往复式类型压缩机设计及构造规范和数据表》.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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