3720| 10
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螺紋孔正反面 |
點評
把螺紋看成斜面,假設上高下底,轉180°不還是上高下底
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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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