单项选择题
A.CH3CH2COOCH3 B.CH3COOCH2CH3 C.HCOOCH3 D.CH3CH2COOCH3CH2
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
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