8209| 19
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45與40cr軸的調(diào)質(zhì)問題 |
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點(diǎn)評(píng)
所謂交變載荷,,更多是指頻繁正反轉(zhuǎn)或者頻繁啟停的那種情況。
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點(diǎn)評(píng)
是的,難道不知道金屬學(xué)與熱處理這門課嗎,?
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