ygs67 发表于 2015-6-18 09:20:37

ASTM A758 A758M-13

ASTM A758 A758M-13 Standard Specification for Wrought-Carbon Steel Butt-Welding Piping Fittings with Improved Notch Toughness

admin 发表于 2015-6-23 11:40:00

谢谢您的分享,金币已奖励!
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