In metallurgical engineering，three main kinds of procedure technology are:

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）
正确答案：Pyrometallurgy(火法冶金）；Hydrometallurgy（湿法冶金）；Electrometallurgy（电冶金）