A.HCHO和CH3CH2COOH B.CH3CH2COOH和CH3COOH C.HCOOH和CH3CH2OH D.CH3CH2COOH和CH3CHO
A.HCHO B.CH3CHO C.HCOOH D.CH3CH2COOH
A.NaHCO3 B.Na2CO3 C.NaOH D.FeCl3