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【多选题】
指出下列有机反应的反应机理(比如:
A.
自由基取代反应、
B.
自由基加成反应、
C.
亲电取代反应、
D.
亲电加成反应、
E.
亲核取代反应、
F.
亲核加成反应) ( 填写选项 ) 。
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参考答案:
举一反三
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A.
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B.
has never been
C.
never was
D.
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