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【单选题】
酶原之所以没有活性是因为A.
酶蛋白肽链合成不完全
B.
酶活性中心没有形成或暴露
C.
酶原是普通的蛋白质
D.
缺乏辅酶或辅基
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反馈参考答案：
举一反三
【单选题】In some societies a man has more than one wife and the first one is more important than the others.
A.
Right.
B.
Wrong.
C.
Doesn't say.
【简答题】A．Less than one year. B．More than one year. C．Less than one term. D．More than one term.
【单选题】The best-known example of Sumerian writing is ___________, which is more than a thousand years earlier than Greek epics.
A.
the Epic of Gilgamesh
B.
Homer’s Iliad
C.
The Seven Tablets
D.
Hammurabi Code
【单选题】炉膛负压摆大，瞬间负压到最大，一、二次风压不正常降低，水位瞬时下降，气压、气温下降说明此时发生( )。
A.
烟道面燃烧
B.
吸、送风机入口挡板摆动
C.
锅炉灭火
D.
炉膛掉焦
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