3370| 9
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學生提問:如圖所示一個鍛件的孔如何加工 |
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天天好可愛哦!
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你不能說坑爹……
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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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