13163| 21
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螺栓,螺纹,螺栓孔,螺纹孔,螺纹底孔之间的关系 |
点评
有可能他说的螺栓孔是过孔哦!
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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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