单项选择题
A.CH2=CHCH3 B.CH3CH=C(CH3)2 C.(C2H5)2C=C(CH3)2 D.CH3-CH=CH-CH3
A.0.01~0.09 B.0.1~0.2 C.0.2~0.7 D.0.8~1.0
A.200~1000 B.420~700 C.360~800 D.400~800