松雨霞 发表于 2019-9-6 16:19:49

ASTM A1090/A1090M − 19

Standard Specification for
Forged Rings and Hollows for Use as Base Plates in Power
Transmission Structures

admin 发表于 2019-9-6 17:01:35

谢谢您的分享,金币已奖励!

hung 发表于 2019-9-9 10:48:42

謝謝樓主的分享!!!!!!
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