TCVN 4793-1989 Base norms of interchangeability Tolerances for dimensions from 10 000 up to 40 000 mm《互换性的基础规范 10 000~40 000mm尺寸的公差》.pdf

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IRS 70778-2-2018 Recommendations for determining the carrying capacity and fatigue risks of existing metallic railway bridges.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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