CH 3 H3C—CH=C—CH2-CH 3 ●CH2-CH3 ●CH3 m/z=55 CH3 H3C—CH=C+ H3C—cHC=CH2 41 m/z=69 10 当m 69 55 84(M) 27 20 10 0102030405060708090100110 页/页 页84(M ) 0 10 20 30 40 50 60 70 80 90 100 110 69 55 41 27 10 0 80 90 100 60 50 30 20 40 70 % OF BASE PEAK H3C CH C CH3 CH2 CH3 H3C CH C CH3 H3C CH C CH3 CH2 CH2 CH3 CH3 m/z=69 m/z=55