5139| 10
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這個孔怎么加工,?一個圓柱體,,中間的孔怎么加工,,上直徑6,,底部直徑8,,最下面是個倒錐 |
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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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