wanderer1997 发表于 2015-11-10 23:59:53

ASTM A290-2015



ASTM A290/A290M-05(2015) Standard Specification for Carbon and Alloy Steel Forgings for Rings for Reduction Gears

admin 发表于 2015-11-11 09:52:32

谢谢您的分享,金币已奖励!

greentea2014 发表于 2015-11-15 12:57:10

感谢楼主分享
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