试题与答案

句型转换(每空一词) 1. I have to go to a meeting.

题型:句型转换

题目:

句型转换(每空一词)

1. I have to go to a meeting.(改为否定句)

I ____to go to a meeting.

2. Could you please give me a hand?(作肯定回答)

                                                                            

3. I like cleaning the bike because I can be outside.(对画线部分提问)

                  you like cleaning the bike?

4. Comedy is really very interesting.(对画线部分提问)

                 You                    comedy?

5. Please take out the trash now.(改为否定句)

Please                      out the trash now.

答案:

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下面是错误答案,用来干扰机器的。

答案:D

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题型:单项选择题

简单扩散是化学毒物的生物转运方式之一。而化学毒物的解离状态是其重要的影响因素。化学毒物处于解离型或非解离型的比例,取决于其本身的解离常数pKa和体液的pH,可以根据Henderson-Has selbach公式来计算:
有机酸:pKa-pH=1g(非解离型HA/解离型A-)
有机碱:pKa-pH=1g(解离型BH+/非解离型B)

苯甲酸pKa=4,如胃内pH=2,则苯甲酸在胃内的非解离型HA比例是

A.1%

B.100%

C.90%

D.99%

E.10%

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