松雨霞 发表于 2019-9-6 14:51:49

ASTM A49 −12 (Reapproved 2019)

Standard Specification for Heat-Treated Carbon Steel Joint Bars, Microalloyed Joint Bars, and Forged Carbon Steel Compromise Joint Bars

admin 发表于 2019-9-6 17:00:17

谢谢您的分享,金币已奖励!

hung 发表于 2019-9-9 10:48:09

謝謝樓主的分享！！！！！！
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