NF A05-400-1998 Evaluation of resistance of steel products to hydrogen induced cracking (HIC) 《钢产品抗氢诱发断裂的评估(欧洲标准EN 10229)》.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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