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①CH3CH2CH2CH3 ②CH3CH2CH(CH3)2 ?③(CH3)2CHCH2Cl ④CH3(CH2)3Cl
A.①② B.③④ C.②③ D.①②③④
下列物质中互为同分异构体的是
A.O2和O3 B.
C. CH3COOH和HCOOCH3 D.和