4340| 9
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需要一種外層強度高、耐磨,心部強度低、韌性好的鋼材 |
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點評
普通熱處理不普通,最普通的材料也是適應最廣泛的,貓言甚善.
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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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