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
下面四个图案:不等边三角形、等边三角形、正方形和矩形,其中每个图案花边的宽度都相同,那么每个图形中花边的内外边缘所围成的几何图形不相似的个数有( )
If you do some more reading, listening and speaking, you can the number of words and your listening and understanding ability.