单项选择题
A.CH3COCH2CH3 B.CH3COOCOCH3 C.CH3CH2OCH3 D.CH3COOCH3
A.CH3CHO B.CH3CH2COOH C.CH3CH2OH D.CH3COCH3
A.CH3CH2-O-CH2CH3 B. C. D.
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