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以下烃中二氯代物只有两种的是( )
A.(CH3)2CHCH3 B.CH3CH2CH3 C. CH3CH2CH2CH3 D.C(CH3)4
A.(CH3)2CHCH3 B.CH3CH2CH3 C.CH3CH2CH2CH3 D.C(CH3)4