A.(CH3)2CHCOCH3 B.(CH3)3-c-CHO C.CH3CH2CH2COCH3 D.CH3CH2COCH2CH3
A.質(zhì)荷比 B.波數(shù) C.化學(xué)位移 D.保留值
A.CH3CH2CI B.CH3CH2OH C.CH3CH3 D.CH3/CH(CH3)2