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问题 单项选择题

已知某酶的Km为0.05mmol/L，试问要使此酶所催化的反应速度达最大反应速度的80%时，底物浓度应是（）

A.0.2mmol/L

B.0.4mmol/L

C.0.5mmol/L

D.0.6mmol/L

E.0.8mmol/L

答案

参考答案：A

写作题

书面表达。

      假设你是李华,请根据下图提示,给美国笔友Peter写一封信,介绍你校学生的课外生活,并

谈谈你的感受。

     注意: 1. 信的开头和结尾已写好。

              2. 词数不少于60。

Dear Peter,

      How are things going? Now I'd like to tell you something about our out-of-class activities. ____

________________________________________________________________________

     I hope to know more about your out-of-class activities. Looking forward to hearing from you.

                                                                                                                                Yours sincerely

                                                                                                                                       Li Hua

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问答题 简答题

带式输送机的清扫器的作用是什么？
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