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石墨轴承和不锈钢轴的滚动摩擦因数大概多少啊 |
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 2015-3-11 16:07:50