21108| 56
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關于砂輪加工問題 |
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點評
白剛玉適合磨淬火鋼,45鋼熱處理后硬度肯定是提高了.
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小黑屋|手機版|Archiver|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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