图甲是H2O2酶活性受pH的影响,图乙表示在最适温度下,pH=b时H2O2分解产

题型:选择题

问题:

图甲是H2O2酶活性受pH的影响,图乙表示在最适温度下,pH=b时H2O2分解产生的O2量随时间的变化。若该酶促反应过程中改变某一初始条件,以下改变正确的是

[ ]

A.pH=a时,e点下移,d点左移

B.pH=c时,e点不为0

C.温度降低时,e点下移,d点右移

D.H2O2量增加时,e点不移,d点左移

考点:实验:比较过氧化氢在不同条件下的分解
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短文填空.

     Mr Smith offers us some advice on how to write a good composition , whichi

_______ the following steps.                                                                                                                    

                                                                                                                                   l.___________

     Firstly,we should read the topic c_______ and organize our ideas.

                                                                                                                                  2.___________

Then we start to shape our thoughts __________our own words and finish

                                                                                                                                  3.___________

our writingin theg__________time. After that . wehave tocheckour

                                                                                                                                  4.__________

compositions , payingattentionto _________ (语法) andspelling.Itis very

                                                                                                                                  5.__________

important to read them aloud to ____________(自己 ) or someone else from

                                                                                                                                  6. __________

_____________ to end. Lastly, we had better ask our teachers or classmates for

                                                                                                                                  7. __________

advice on how to improve our writing. If ________(可能) , we may leave

                                                                                                                                   8. __________

them alone for some time before reading again, ___________ will help a

                                                                                                                                   9. __________

a great deal. I hope you will b_______a lot from the advice above.

                                                                                                                                  10.___________

题型:选择题

肺痨后期可转成

A.哮证
B.肺痿
C.肺痈
D.肺痨

题型:选择题

鱼类体形可分为()、扁形、圆筒形和侧扁形。

A、立体形

B、圆锥形

C、梭形

D、三角形

题型:选择题

简述地表水的基本特点?

题型:选择题

只有熟悉各种烹饪原料所具有的()及其成熟后的(),才能在菜肴组配时进行适当的搭配。

A、调味特性;香味特征

B、口味特征;口味特征

C、气味特征;气味特征

D、香味特征;香味特征

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