16291| 12
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滲氮后零件可以發黑嗎? |
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點評
硝酸鈉?常溫發黑? 酸洗是用亞硝酸鈉。
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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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