单项选择题
A.CH3-CH=CH-CH3 B.CH3-CH2OH C.CH2=CH-CH2-CH=CH2 D.CH2=CH-CH=CH-CH3
A.a>b>c B.c>b>a C.b>a>c D.c>a>b
A.a>b>c B.c>a>b C.b>c>a D.c>b>a