JUS ISO 4492-1991 Metallic powders excluding powders for hardmetals Determination of dimensional changes associated with compacting and sintering《金属粉末（不包括硬质合金粉末） 压实与烧结的尺寸变化的测定》.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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