A:分子式为C2H6O的同分异构体有两个,分别是H3C-O-CH3和CH3CH2OH
B:分子式为C8H10的芳香烃有3个
C:分子式为C4H8的烯烃同分异构体有2个,分别为CH2=CHCH2CH3、CH3CH=CHCH3
D:二氯甲烷有两种同分异构体
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