多项选择题

紫外光谱用于药物鉴别的特征参数有（）

A．最大吸收波长
B．肩峰
C．吸光度比值
D．吸收系数

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酯与含有活性亚甲基的化合物在醇钠等碱性催化剂作用下发生缩合反应，脱去一分子醇得到β-羰基化合物的反应叫酯缩合反应。( )

答案：正确

Dialogue
Waiter (W):  1____.
   Guest (G) :  Yes, I think we ‘re ready. My friend would like the lamb and I’d like the fillet steak with fried potatoes and a green salad.
    W:   One lamb and one fillet steak with fried potatoes and a green salad.2 .
    G1:    Oh, medium, please.
    W:       Very good, sir. And would you like anything to start?
    G2:       Yes, I’d like a soup.
    W：      3 madam?
    G2:       Oh, the vegetable soup, I think.
    W:        Vegetable soup, and for you sir?
    G1:       Well, I am slimming. I am not too sure.
W:       4.
G1：   OK, yes
    W:        5_.
    G1:       Yes, we will have Red California.

答案：第1组： 1. ...