题目内容

下列药物中可用重氮化一偶合反应鉴别的是

A. 盐酸丁卡因
B. 盐酸普鲁卡因
C. 盐酸利多卡因
D. 盐酸布比卡因
E. 盐酸氯胺酮

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不加热而提取效率高的提取方法是 ()

下列各题共用备选答案 A.水杨酸类 B.吡唑酮类 C.芳基烷酸类 D.乙酰苯胺类 E.1,2-苯并噻嗪类

The teller of a humorous story________.

A. laughs at his own joke
B. repeats it several times
C. is very serious when hetells it
D. is conoelTled about thereaction of his listeners

To whom does the mother speak Korean?

A. Her+oldest daughter only.
B. Her two daughters only.
C. AU of her children.
D. Only to her son.

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