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killer007 发表于 2017-11-16 18:20:26

BS EN 1515-3-2005 Flanges and their joints — Bolting — Part 3：Classificati

BS EN 1515-3-2005 Flanges and their joints — Bolting — Part 3：Classification of bolt materials for steel flanges, class designated

admin 发表于 2017-11-17 11:10:03

谢谢您的分享，金币已奖励!

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