下列变化必须加入还原剂才能发生的是:A.CaCO3 → CO2   B.CO → CO

下列变化必须加入还原剂才能发生的是:

A.CaCO3 → CO2   B.CO → CO2   C.CuO →  Cu    D.Na→ NaOH

 

答案

C

解析:略

 

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