GB985-88气焊、手工电弧焊及气体保护焊焊缝坡口的基本形式与尺寸.pdf
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2009-10/GB985-88气焊、手工电弧焊及气体保护焊焊缝坡口的基本形式与尺寸.rar 2009-10/GB985-88 gas welding, manual arc welding and gas welding groove weld the basic form and size. Rar
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2009-10/GB985-88气焊、手工电弧焊及气体保护焊焊缝坡口的基本形式与尺寸.rar 2009-10/GB985-88 gas welding, manual arc welding and gas welding groove weld the basic form and size. Rar