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A.(CH3)2O B.CH3CHO C.CH3OH D.HCHO
A.(CH3)2O B.CH3CHO C.HCHO D.C2H2和H2O
A.(CH3)2O B.HCHO C.CH3CHO
A.(CH3)2O B.CH3CHO
C.HCHO D.C2H2和H2O