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【单选题】
酶的化学修饰A.
是酶促反应
B.
是不可逆的共价反应
C.
只有磷酸化、去磷酸化
D.
活性中心的催化基团发生化学变化后酶的催化活性发生改变
E.
活性中心的结合部位发生化学变化后与底物结合的能力加强或减弱
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反馈参考答案：
举一反三
【单选题】小刘测得某三相发电机绕组接成星形时线电压是 6.3KV ,如果将其接成三角形,则测得线电压为( )
A.
10.9KV
B.
6.3KV
C.
3.64KV
D.
4.63KV
【简答题】水泥稳定土中含水量对其强度影响较大,其主要原因是当含水量较小时, 、 。
【单选题】The two boys have helped each other and formed a deep and lasting _________.
A.
friendship
B.
difference
C.
connection
D.
competition
【单选题】The two advertising agencies formed an alliance to seek_______to locate potential customers in times of difficulty.
A.
innocently
B.
suddenly
C.
cooperatively
D.
needlessly
【简答题】I have formed the habit of keeping a diary in English since I started senior high school two year a________. My English teacher encouraged us to write something in English, She told________(记录) what h...
【简答题】第一空请输入1-3题答案,第2空请输入4-6题答案,第3空请输入7-10题答案。可拍照上传。
【单选题】These compounds could not have been formed if the chemical reaction ______ stopped.
A.
have been
B.
has been
C.
had been
D.
were
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