1079| 6
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請(qǐng)問,硅為何能提高鋼的彈性比例極限?原理是什么? |
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點(diǎn)評(píng)
哈哈哈哈,說(shuō)的好,應(yīng)該把它扔進(jìn)煉鋼爐子,好好問問鋼水
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