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铁基粉末冶金工件（HRB52~72）的切屑参数手册 |
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 2009-6-10 08:47:57