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五波钢结构 · 2012. 4. 19. · gb/t 11263— 2010 bij gb/t 1. 1—2009 h jis gb/t h t gb/t 11263—2005 : h500 x x h300 x 200 jis g3192—2008 : 19 19 5 t2 5 mm" 5 mm o gb/t
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