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下列化合物中,既显酸性又能发生加成反应的是( )
A、CH2=CH—CH2OH B、CH3COOH
C、CH2=CH—COOC2H5 D、CH2=CH—COOH
A. CH2=CH—CH2OH B. CH3COOH
C. CH2=CH—COOH D. CH2=CH—COOC2H5
A.CH2=CH—CH2OH B. CH3COOH C.CH2=CH—COOC2H5 D. CH2=CH—COOH