题目内容
下列变化,是通过取代反应来实现的是
2021-09-08
A.CH3CH2OH→CH3CHO
B.CH2=CH2→CH3CH2Br
C.
D.CH3COOH→CH3COOC2H5
试卷相关题目
SQL Error: select id,body,options from ***_enewstiku_ where sourceid='21934' and id < 1914943 and id<>'1914943' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='21934' and id > 1914943 and id<>'1914943' order by id asc limit 5