ASTM A500/A500M-13 圆形与异型冷成型焊接与无缝碳素钢结构管标
ASTM A500/A500M-13 Standard Specification for Cold-Formed Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes圆形与异型冷成型焊接与无缝碳素钢结构管标准规范
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