3042| 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(shè)上高下底,轉(zhuǎn)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(wǎng)安備33038202004372號 )
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