下列转化过程，需要加入还原剂才能实现的是：( )

题干

C：HCl→Cl₂

A：CaCO₃→CO₂

B：NH₄⁺→NH₃

D：Fe₂O₃→Fe

上一题下一题 0.0难度选择题更新时间:2012-11-07 12:43:54

things more map night white

1. What a big ____________of America !

2. Tell me ______________about the Great Wall .

3. There are lots of ______________to see.

4. The American flag is red and blue and ___________________.

5. You can always see it , every day and __________________.

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