下列物质既能发生消去反应，又能氧化成醛的是（　　）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='22306' and id < 1956126 and id<>'1956126' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='22306' and id > 1956126 and id<>'1956126' order by id asc limit 5