CNS 12705-1990 Method of Test for Particle Size Distribution of Alumina or Quartz by Nitrogen Adsorption《氧化铝或石英粒度分布测定法（电感测带技术）》.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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