有9种,分别是：
C6H5-CH2CH2CH3
C6H5-CH(CH3)2
CH3-C6H4-CH2CH3(邻位、间位、对位共3种)
CH3-C6H3-CH3(三取代位置可以是1,2,3；1,2,4；1,3,4；1,3,5共4种)
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CH3