4219| 10
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鑷子的疑問 |
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點(diǎn)評(píng)
這個(gè)有什么難的,難道熱處理一定要整體熱處理的嗎,局部或表面熱處理不是很正常?
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點(diǎn)評(píng)
有種方法可以只有表面0.02硬化,
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