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關(guān)于黃銅的幾個(gè)簡(jiǎn)單問(wèn)題,,請(qǐng)教 |
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點(diǎn)評(píng)
銅分冷熱軋,?你還是去百度先弄清楚冷熱軋的概念,目的,,意義在說(shuō)吧
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