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【多选题】
SN1机理反应的特点有A.
单分子反应，反应分两
B.
手性碳构型完全翻转
C.
有活泼中间体碳正离子生成
D.
反应一步完成
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【单选题】Well, no gain without pain, they say. But what about pain without gain? Everywhere you go in America, you hear tales of corporate revival. What is harder to establish is whether the productivity revol...
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B.
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C.
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