2897| 10
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螺紋孔正反面 |
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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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小黑屋|手機版|Archiver|機械社區(qū) ( 京ICP備10217105號-1,京ICP證050210號,,浙公網安備33038202004372號 )
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