下列反应中,属于取代反应的是①CH3CH=CH2+Br2CH3CHBrCH2Br②CH3CH2OH CH2=CH2↑ +H2O③CH3COOH+CH3CH2OHCH3COOCH2CH3+H2O④C6H6+HNO3C6H5NO2+H2O
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