2－甲基－1,3－丁二烯的化学结构简式怎么写?
CH2=C-CH=CH2 CH2=C-CH-CH2
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CH3 CH3
(A) (B)
A对还是B对?
`
CH2=C-CH=CH2 ````CH2=C-CH-CH2
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```````CH3`````````````````````CH3
``(a)``````````````````(b)