单项选择题
A.(CH3)2C===CHCH3 B.(CH3)2C===CH2 C.(CH3)2C===C(CH3)2 D.CH3CH===CH2
A.③>①>④>② B.②>③>①>④ C.①>②>④>③ D.①>②>③>④
A.A B.B C.C D.D