下列选项中,属于碳二加氢催化剂的毒物的是()。A.甲烷 B.硫化氢 C.丙烷 D.乙

题型:单项选择题

问题:

下列选项中,属于碳二加氢催化剂的毒物的是()。

A.甲烷

B.硫化氢

C.丙烷

D.乙炔

考点:乙烯装置操作工乙烯反应器系统乙烯反应器系统题库
题型:单项选择题

环境风险一级评价应按《建设项目环境风险评价技术导则》对事故影响进行()预测,说明影响范围和程度,提出防范、减缓和应急措施。

A.定量

B.定性

C.定量或定性

D.半定量

题型:单项选择题

下列问题类型中,()是含有房地产经纪人精心组织的短语或对客户已使用的关键词进行重复的问题。

A.指引型问题

B.镜像型问题

C.封闭式问题

D.开放式问题

题型:单项选择题

完形填空(共15小题;每小题1分,满分15分)

阅读下面短文,掌握其大意,然后从16—30各题所给的A、B、C和D项中,选出最佳选项,并在答题卡上将该项涂黑。

When I moved into an empty dormitory for the first time two years ago, I was certain of a few things. Firstly, I realized that I didn’t  16  anybody at the school. Secondly, I knew that I wanted to work hard at my lessons and learn something useful. And thirdly, I wanted to have a good time with new classmates, without my parents around.

The first  17  frightened me in the beginning. But that  18  quickly disappeared. It was the other two goals  19  ended up being my difficulties. I knew that it was hard to devote enough time to class and to social efforts. But I wanted to  20  in both. I knew this would be a  21  , but I didn’t realize how much until classes began.

I got on well with the other girls who lived in my dorm.  22 , instead of finishing my homework  23 it was due, I went upstairs and had ice cream with my neighbor. I always finished it the next day between classes. I knew it wasn’t very good and the grade I  24  showed my lack of effort.

I was  25  that I needed to find some sort of balance. So I created a schedule that would  26  my time up between going to class, doing homework, and relaxing. It seemed like a good idea, but I was only able to  27  it for a few days. A schedule like that was too much pressure.

So I tried another 28 . Each week I made a list of everything I had to get done during that week. Then, under the list of things I had to get done, I made a list of things I could do if I had time.

This is the method I have used since then. I’m glad that I’ve learned to  29  things and it has  30  prepare me for what is to come after graduation.

16. A. know      B. recognize     C. realize             D. like

17. A. teacher      B. day                C. class              D. realization

18. A. happiness   B. excitement    C. fear         D. desire

19. A. which     B. what              C. that              D. who

20. A. win         B. succeed        C. get               D. wish

21. A. chance     B. job                 C. challenge          D. time

22. A. Often     B. Seldom           C. Unluckily           D. Fortunately

23. A. because       B. when                      C. after              D. before

24. A. demanded          B. took               C. accepted                  D. received

25. A. asleep        B. awake           C. ashamed                    D. aware

26. A. fix            B. divide            C. put               D. build

27. A. use         B. keep              C. follow             D. make

28. A. plan        B. energy          C. pressure           D. effort

29. A. do           B. control          C. balance                    D. hold

30. A. had         B. helped          C. let                 D. forced                         

题型:单项选择题

主动脉瓣狭窄( )

A.最易出现周围血管征
B.最易发生咯血
C.最易引起左心房和左心室同时增大
D.最易发生晕厥和心绞痛
E.最易发生右心室增大

题型:单项选择题

简述反应温度对反应速度的影响。

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