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【单选题】
下列关于酶活性中心的描述,哪一项是 错误 的:A.
活性中心是酶分子中直接与底物结合，并发挥催化功能的部位
B.
活性中心的基团按功能可分为两类，一类是结合基团，一类是催化基团
C.
酶活性中心的基团可以是同一条肽链但在一级结构上相距很远的基团
D.
不同肽链上的有关基团不能参与构成该酶的活性中心
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【单选题】The Australian boy has a good ________ of Chinese and can express himself freely in it.
A.
power
B.
command
C.
demand
D.
usage
【简答题】公路上使用骨料与一般建筑中不同,通常采样骨料的含水状态为 状态 。
【简答题】The new technique for growing rice will certainly ______ the increase of crop yields or a large scale.
【单选题】Q: What will Katy do to solve her problem?
A.
Go to Jason’s party.
B.
Go to Linda’s party.
C.
Attend both Jason’s and Linda’s parties.
D.
Celebrate Halloween with her parents.
【单选题】It can be learned that street dining______.
A.
is strange to most Londoners
B.
has become common in London
C.
first appeared in university towns
D.
has become a trend in most cities
【单选题】One explanation given by scientists for the crop circles is that they are made by ______.
A.
airplane crashes
B.
air movement
C.
unknown flying objects
D.
new farming techniques
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