飞天2012201411 发表于 2018-4-25 10:24:37

BS 3293-1960 specification for carbon steel pipe flanges(over24inches nominal si

BS 3293-1960 specification for carbon steel pipe flanges(over24inches nominal size)-for the petroleu

admin 发表于 2018-4-25 11:19:25

谢谢您的分享，金币已奖励!
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