CH3C(CH3)2CH2CH2CH2CH3、CH3CH2C(CH3)2CH2CH2CH3、CH3CH(CH3)CH(CH3)CH2CH2CH3、CH3CH(CH3)CH2CH(CH3)CH2CH3、CH3CH(CH3)CH2CH2CH(CH3)CH3、CH3CH2CH(CH3)CH(CH3)CH2CH3、CH3CH2CH(C2H5)CH2CH2CH3我只能写出这7种...