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举例 CH3CH2C=CHCH3 (CH3)2C=CH-CHO (有) (无) CH3CH2CHCH-CH H3(无) Ph-C=CHCH2 CH3 (有举例: CH3CH2C=CHCH3 CH3 (CH3 )2C=CH-CHO CH3CH2CHCH=CH2 CH3 Ph-C=CHCH2CH3 Cl (有) (无) (无) (有)
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