STAS SR ISO 868-1995 Plastics and ebonite - Determination of indentation hardness by means of a durometer (Shore hardness)《塑料和硬橡胶．通过硬度计测定压痕硬度（肖氏硬度）》.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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