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【多选题】
下列哪些因素有利于单分子亲核取代反应( )A.
底物的离去基团离去能力强
B.
亲核试剂的亲核性弱
C.
底物的离去基团离去能力强，且形成的中间体碳正离子稳定
D.
亲核试剂的亲核性强
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【简答题】“中国文学”一科诞生于____________(文件名称),这是中国近代教育史上第一个正式公布并在全国范围内普遍实施的学制。
【单选题】听力原文：M: Henry, did you type the letter for Nancy and John yesterday? W: No, I had Peter do it on his computer. Q: Who typed the letter? (9)
A.
Henry.
B.
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C.
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D.
Nancy.
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