摘要：21．下列各对物质中.互为同分异构体的是 A． CH3-CH2-CH3和CH3-CH2-CH2-CH3 D．CH3一CH＝CH-CH3和CH3-CH ＝C-CH3 CH3 C． CH3-CH＝CH-CH3和CH3-CH2-CH＝CH2 CH3 CH3 D．CH3-CH - CH-CH3和CH3-CH - CH-CH3 CH3 CH3

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