下列反应中,属于取代反应的是 ①CH3CH=CH2+Br2→CCl4CH3CHBrCH2Br
②CH3CH2OH→△浓H2SO4CH2=CH2+H2O
③CH3COOH+CH3CH2OH→浓H2SO4CH3COOCH2CH3+H2O
④C6H6+HNO3→△浓H2SO4C6H5NO2+H2O
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