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【单选题】
α , β - 不饱和羰基化合物与共轭二烯反应得环己烯类化合物 , 这叫什么反应 ?A.
Hofmann 反应
B.
Sandmeyer 反应
C.
Diels-Alder 反应
D.
Perkin 反应
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反馈参考答案：
举一反三
【简答题】根据巴比妥类药物的结构通式描述巴比妥类镇静催眠药物的构效关系。
【简答题】Questions l2 to 15 are based on the conversation you have just heard. ◆12.A.He wants to change his job assignment. B.He is unhappy with his department manager C.He thinks he deserves extra pay for ove...
【简答题】面心立方结构的一个晶胞中四面体间隙的数量为 个。(填写数字)
【简答题】下列四组螺钉的画法,画得正确的有( )。A. B. C. D.
【单选题】Some people think Mr. Smith is crazy because
A.
he is often motivated to change.
B.
he is in the media business.
C.
he often makes unreasonable decisions.
【单选题】Some people think Mr Murdoch is crazy because
A.
he is often motivated to change.
B.
he is in the media business.
C.
he often makes unreasonable decisions.
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