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HG/T 20537.4-1992 化工装置用奥氏体不锈钢大口径焊接钢管技术要求 |
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小黑屋|手机版|Archiver|机械社区 ( 京ICP备10217105号-1，京ICP证050210号，浙公网安备33038202004372号 )
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发表于 2008-11-30 23:45:54
