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【单选题】
下列分子中超共轭效应最大的是（）A. CH3CH2CH=CH2 B. (CH3)2C=C(CH3)2 C. CH3CH=CHCH3 D. CH2=C(CH3)CH2CH3
A.
CH 3 CH 2 CH=CH 2
B.
(CH 3 ) 2 C=C(CH 3 ) 2
C.
CH 3 CH=CHCH 3
D.
CH 2 =C(CH 3 )CH 2 CH 3
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