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1、INTERNATIONA1.STANDARDISO3834-4editionThird202104Qua1.ityrequirementsforfusionwe1.dingofmeta1.1.icmateria1.s一pBntaryqua1.ityrequirementsExigencesdequa1.iteensoudageparfusiondesmateriauxmeta1.1.iques一Partie4:Exigencesdequa1.itee1.ementsireReferencenumberISO383442021(E)COPYRIGHTPROTECTEDDOCUMENTISO202
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