题目内容
下列制取气体的方案，可以直接采用如图所示装置进行的有( ) 
①用H 2O 2和MnO 2制取O 2 ②用CaCO 3和稀盐酸制取CO 2 ③用KClO 3和MnO 2制取O 2 ④用Zn和稀H 2SO 4制取H 2 ⑤用Cu和浓HNO 3制取NO 2
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