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【单选题】
紫外分光光度法测定氨苄西林钠的含量,其方法为( )A.
在酸性条件下降解氨苄西林钠,测定其降解后的紫外光谱
B.
经碱水解后,测定水解产物的紫外光谱以标准对照法计算含量
C.
测定氨苄西林钠降解产物铜盐的紫外光谱,以标准对照法计算含量
D.
以不经降解同样量的样品作为空白对照
E.
在咪唑催化下形成青霉素稀硫酸汞盐,测定该盐的紫外光谱,以标准对照法计算
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【单选题】What is the discussion mainly about?
A.
Catherine de Medici's entertainments
B.
The figures for court dancing
C.
The development of the ballet
D.
The relationship between dance and meals
【单选题】– What is Kitty doing the day after tomorrow? –_________.
A.
She went to the movie
B.
She is studying for a math test
C.
She has s sore throat
D.
She gets to school by train
【单选题】What is true about the cost?
A.
It must be paid in one lump sum.
B.
There is a reduced rate for those who register soon.
C.
There is a 10% discount for new subscribers.
D.
It is cheaper for association members.
【简答题】三) 判断下列句子中划线单词的词性。 1. Mary dances well . 2. Think well before you act. 3. Well , I didn't think to see you here! 4. I'm not well , my head aches. 5. Water wells from a spring beneath the rock. 6. An o...
【单选题】132 Using the situation stated in the Special window, what is the cost performance index for Case #9?
A.
1.10
B.
1.91
C.
0.83
D.
1.20
E.
None of the above
【简答题】My head aches. ______
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