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【单选题】
将下列化合物按亲电加成反应的活性由大到小排列的是 :( ) 1 苯 2 吡咯 3 噻吩 4 呋喃
A.
②④③①
B.
④②③①
C.
①③②④
D.
②①③④
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举一反三
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Anne
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0.5V
B.
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A.
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【单选题】“消费者”和“电子商务消费者”最根本的区别在于()。
A.
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B.
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C.
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D.
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