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冶炼金属常用以下几种方法: ①用C,CO,H 2 做还原剂还原, ②用较活泼金属Na,Mg等还原, ③利用铝热反应的原理还原, ④电解法, ⑤热分解法。 下列金属各采用哪种方法还原最佳? (1)Fe,Zn,Cu等中等活泼金属________; (2)Na,Mg,Al等活泼或较活泼金属_________; (3) Hg,Ag等不活泼金属_______; (4)V,Cr,Mn,W等高熔点金属________; (5)K,Rb,Cs,Ti等金属的通常还原方法_______。
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