______ the website of the Fire Department in your city, and you will learn a lot about firefighting. A.Having searched B.To search C.Searching D.Search 答案: D今有五种有机物:①CH2OH(CHOH)4CHO,②CH3(CH2)3OH,③CH2=CHCH2OH,④CH2=CHCOOCH3,⑤CH2=CHCOOH.其中既能发生加成反应、加聚反应、酯化反应,又能发生氧化反应的是
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A.③⑤B.①②⑤
C.②④D.③④