2742| 7
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這樣的齒輪對材料和熱處理有何特殊要求? |
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點評
應該普通氮化就可以
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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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