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【单选题】
柱分配层析-紫外分光光度法测定乙酰水杨酸含量时,以加有碳酸氢钠的硅藻土为固定相,用氯仿洗脱的是( )。A.
乙酰水杨酸
B.
水盐酸
C.
中性或碱性杂质
D.
水杨酸和乙酰水杨酸
E.
酸性杂质
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举一反三
【单选题】I can think of many cases ______ students can’t write a good article though having a large vocabulary.
A.
where
B.
which
C.
that
D.
to which
【多选题】微生物发酵工程发酵产物的类型主要包括:
A.
产品是微生物菌体本身
B.
产品是微生物初级代谢产物
C.
产品是微生物次级代谢产物
D.
产品是微生物的转化代谢产物
E.
产品是微生物的诱导物
【单选题】听力原文：W: You don't look too happy. What's the problem? M: Well, I've got to write a composition for my English class, and I just can't come up with any idea, and it's due tomorrow. Q: What is the man's...
A.
He hasn' t decided on a topic for his composition.
B.
He has fallen behind others in English class.
C.
He hasn't made up his mind as to what to write about.
D.
The book he borrowed will be due tomorrow.
【单选题】听力原文：W: You don't look too happy. What's the problem? M: Well, I've got to write a composition for my English class, and I just can't come up with any idea, and it's due tomorrow. Q: What is the man's...
A.
He has to change the topic for his composition.
B.
He has fallen behind others in English class.
C.
He hasn't made up his mind as to what to write about.
D.
The book he borrowed will be due tomorrow.
【简答题】发酵工程中游技术是指发酵过程控制主要包括( )、( )、( )。
【简答题】生物技术主要包括：( ) A: 基因工程 B: 酶工程 C: 发酵工程 D: 细胞工程
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