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问题 单项选择题

测定代谢物Ax的酶偶联反应A B C D Ea Ea Eix → → → 1 2之中，关于零级反应、一级反应的描述正确的是（ ）

A．三个酶催化的都是零级反应

B．Ea1和Ea2催化的是零级反应，Ei催化一级反应

C．E a1催化的是零级反应，Ea2和Ei催化一级反应

D．三个酶催化的都是一级反应

答案

参考答案：D

填空题

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What does he do at present
He is（）
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单项选择题

根据《中华人民共和国合同法》，设计合同当事人产生纠纷后首先应采取的措施是()

A.协商

B.调解

C.仲裁

D.诉讼
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