A.化學(xué)位移 B.質(zhì)荷比 C.保留值 D.波數(shù)
A.CH3Cl B.乙烯 C.苯 D.CH3Br
A.溶劑效應(yīng) B.立體障礙 C.共軛效應(yīng) D.都不對(duì)