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准备做一液压机的下压头,材料选择什么好?现在压头与磨具接触端面已有凹坑 |
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Archiver|手机版|小黑屋|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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