3555| 4
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孔有黑色的固體膠狀物,用超聲波清洗機(jī)無法清洗干凈 |
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點(diǎn)評(píng)
有辦法去掉嗎?最好是化學(xué)方法.
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點(diǎn)評(píng)
熱處理前有清洗的.淬火后很臟,回火后就成這樣了.
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