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In metallurgical engineering，three main kinds of procedure technology are:
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In metallurgical engineering，three main kinds of procedure technology are:
A.Pyrometallurgy(火法冶金）
B.Hydrometallurgy（湿法冶金）
C.Electrorefining（电解精炼）
D.Electrometallurgy（电冶金）
参考答案: