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GB 711-1988 优质碳素结构钢热轧厚钢板和宽钢带 |
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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 2007-11-16 08:34:00
