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【单选题】
下列哪个氨基酸在 pH=6 的溶液中进行电泳时向负极泳动A.
甘氨酸（ pI ＝ 5.97 ）
B.
酪氨酸（ pI ＝ 5.66 ）
C.
谷氨酸（ pI ＝ 3.22 ）
D.
组氨酸（ pI ＝ 7.59 ）
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【简答题】This is a joke about 1. _______ invisible bench. Mike pretends to be sitting on an invisible bench.Soon Tony 2 ._______ (join)him and Mike moves over as if 3. _______ (make)room for him.After a while ...
【简答题】第二节 语法运用(25%) 从下列各题的A、B、C三个选项中选出一个最佳选项填入空白处(每题1分,共25分)。 ( ) 1._______ smoke near the petrol station. A. Doesn't B. Don’t C. Not ( ) 2. _______ straight ahead, then turn right at that corner...
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【简答题】单词拼写。 1. The __________ (国家的) flower of Japan is cherry blossom. 2. She sits in the __________ (中间的) of the classroom. 3. There are many TV__________ (节目) today. 4. What's the __________ (最近的) news ab...
【简答题】What are the two purposes of sleeping? There are two purposes of sleeping: physical rest and ______rest.
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【简答题】What are the two categories of meaning of language proposed by Wilkins? What is the distinction between the two terms?
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