3883| 15
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淬火調(diào)質(zhì) |
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點(diǎn)評(píng)
低碳鋼20si2Mn
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計(jì)算機(jī)專業(yè)改行學(xué)機(jī)械
不要什么知識(shí)點(diǎn)都扯到大學(xué),,我讀技校的都有一門叫《金屬材料與熱處理》
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