NF J24-145-1957 Shipbuilding Flexible piping Ring couplings for flexible pipes and filling necks for loading petroleum products 《造船工业 软管 石油产品装船用甲板套筒的软管连接环》.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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