12837| 21
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螺栓,螺紋,螺栓孔,螺紋孔,螺紋底孔之間的關系 |
點評
有可能他說的螺栓孔是過孔哦!
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Archiver|手機版|小黑屋|機械社區 ( 京ICP備10217105號-1,京ICP證050210號,浙公網安備33038202004372號 )
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