SIS SS-ISO 4063-1990 Welding brazing soldering and braze welding of metals IMomenclature of processes and reference numbers for symbolic representation on drawings《金属定位焊接、钎焊、热焊接及金.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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