相关试题
【判断题】
裂解深度越高，原料转化率越高，H2和CH4也越多，气态产率越大
【判断题】
大检修开车可以直接把汽泡压力控制在11.7MPa
【判断题】
随着KSF增加乙烯收率提高,进一步增加一次应,同时甲烷收率也升高,导致结焦速率加快
【判断题】
在投料炉和与清焦炉切换时,只要同步进行就可以
【判断题】
工业上所指的停留时间是不同的原料有不同的最佳停留时间,取决于原料特性
【判断题】
裂解深度越高,氢气和甲烷就越多,液体产物含氢量就越多
【判断题】
稀释蒸汽发生塔T-270塔液位低,可以将260塔釜温度降低一些
【判断题】
汽油塔290塔顶温度和塔底温度相同,液位正常,是仪表假指示
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开火炬气压缩机时.因为组份变轻,所以不会出现带液现象
【判断题】
当系统燃料气不足时,启动Ｃ5室内操作员要做适当的负压及挡板调节就可以了
【判断题】
裂解的裂解炉，其底部火嘴设计为油气联合烧既可以烧油，也可以烧气，也可同时烧油和气
【判断题】
如果物质的分子发生变化，有新物质产生,这样的变化就是化学变化
【判断题】
含有相同碳原子的二烯烃和炔烃互为同分异构体
【判断题】
当一个可逆反应达到平衡状态后，实际上反应已经停止了
【判断题】
由于芳烃有稳定的芳环结构，不易断链，且在高温下能生成稠环芳轻，因此，裂解原料中芳烃含量越少越好
【判断题】
沸程又叫馏程，它是指单组份烃在一定压力下从初馏点到干点的温度范围
【判断题】
由于管线上的静电量小，因此没有什么危险
【判断题】
当高压蒸汽温度测量的两个热电偶中任一个超过联锁设定值时，就要发生联锁动作
【判断题】
与无机物相比，有机物的特点是熔点较高，易燃，难溶于水和有机溶剂
【判断题】
在同一个原子中，不可能有运动状态完全相同的电子存在
【判断题】
一般地，裂解气的产气率随原料中氢含量的增加而增加
【判断题】
在工业裂解炉的工程设计中，影响乙烯选择性的根本因素是平均停留时间和平均烃分压
【判断题】
为了有效地降低二次反应，急冷锅炉将裂解气温度冷却的越低越好
【判断题】
提高废热锅炉蒸汽压力，可提高管壁温度，加快废热锅炉结焦
【判断题】
安全阀应安装在被保护设备，管线的最近位置上
【判断题】
1211灭火器适用于电气设备火灾，但不适用于油类着火
【判断题】
我们在工厂中所称的“压力”，实际上就是压强
【判断题】
原子核外的电子是按能量大小，从高到低依次填入轨道的
【判断题】
一般地，裂解气中乙烯收率随原料氢含量的减少而减少，C5以上液相产物的收率则随原料氢含量的减少而增加
【判断题】
从热力学角度看，同一正构烷烃分子在相同条件下，断链反应比脱氢反应容易进行
【判断题】
从热力学角度看，不同分子在同一条件下，分子中碳原子数较多的比碳原子数少的分子容易发生断链反应
【判断题】
烷烃中异构烷烃比相同碳原子数的正构烷烃裂解产物中CH4、C3H6、丁烯及芳烃产率低
【判断题】
环烷烃裂解生成的乙烯、丙烯的产率不如链烷烃高，但大于烯烃和芳烃
推荐试题
【单选题】
Tom is a book lover. ______ likes reading very much.
A. He B. She C. You D. It
【单选题】
—May I listen to the music here, Mr. White?
—Sorry, you’d better it like that．
A. not to do B. not do to
C. dont do D. not do
【单选题】
3.—Did you have a good time at Lauras birthday party?
— Yes, indeed. Its several years ________ I enjoyed myself so much.
A. when B. before C. since D. that
【单选题】
4. —___________ is the Summer Palace from here?
About three kilometers away. You can take the No. 35 bus.
A. How long B. How far C. How often D. How much
【单选题】
5. I was looking for a birthday gift for my mother, but I couldnt find ______ suitable.
A. anything B. something C. nothing D. everything
【单选题】
6. A friend of my ____ and I are going to visit_______ next week．
A. father; Browns B. father's; Browns
C. father; the Browns D. father's; the Browns
【单选题】
7. She ______ very hard since she came to our school.
A. studies B. has studied C. is studying D. studied
【单选题】
8. — Who will send you to the new school, your mom or your dad?
— _______. Ill go there by myself.
A. Both B. Either C. Neither D. None
【单选题】
9.—Well do what we can ____English well this term．
—It’s high time for you to work hard．
A. study B．to study C. be studied D. be studying
【单选题】
10. —I’m going to Flower Bookstore. Could you tell me ______?
— Sorry, I don’t know. I’m new here.
A. where it is B. where was it C. where is it D. where it was
【单选题】
11. How do you like the dishes, Eric?
— Fantastic! Nothing tastes ________.
A. nice B. better C. terrible D. worse
【单选题】
12. ______ Lin Feng has to work late, she always wears a smile on her face.
A. Because B. If C. Until D. Though
【单选题】
13.You can save money _______ you buy cheaper things.
A. before B. unless C. if D. until
【单选题】
14. We will have a _________ holiday after the exam．
A. two-month B. two month’s C. two month D. two-months
【单选题】
15. —We will build an underground in Xuzhou before 2015．
— Wow, _______! Will it pass our place?
A. what an excited news B. how excited the news is
C. what exciting news D. how exciting
【单选题】
16. — Emily, here’s a dictionary．I hope it will help you in some way．
— Thank you．It’s ________ what I need．
A. almost B. still C. only D. just
【单选题】
17. —Oh．I’m hungry．Mum, can I have the hamburger on the plate?
—No．It tastes ．
A. terribly B. terrible C. good D. well
【单选题】
18. —We can invite our teachers to the farewell party next Saturday.
—Yes, ______? I’ll call them at once.
A. what for B. what C. why not D. why
【单选题】
19.You can ________ ask the old man to move away to any other place because he has lived ________ here for at least sixty years．
A. hardly; alone B. hard; alone
C. hardly; lonely D. hardly; lonely
【单选题】
20.—I’m going back to see my grandparents this weekend．
—________．
A. It’s very nice of you B. You’d better hurry
C. Say goodbye to them D. Give my best wishes to them
【单选题】
21.—Why not take ____ umbrella with the sign “Made in China”? It is useful.
—What _______ good advice it is!
A. an; a B. a; a C. an; \ D. \; a
【单选题】
22. —Do you know the boy________ is sitting next to Peter?
— Yes. He is Peter’s friend. They are celebrating his ________ birthday.
A. who; ninth B. that; ninth C. /; ninth D. which; ninth
【单选题】
23. It was dark, ______ I couldnt see what was happening.
A. or B. though C. but D. so
【单选题】
24.—You can use MSN to talk with Vivien on the Internet.
—I know. But can you tell me ________?
A. what I can use it B. when I can use it
C. why can I use it D. how can I use it
【单选题】
25. _______ are you going to the School Uniform Exhibition, Amy ?
To learn about different styles of school uniform.
A. What B. Where C. Which D. Why
【单选题】
( ) 26. Where does the writer of "The little Prince" come from?
A．England． B．France． C．America． D．China．
【单选题】
( ) 27. What does the prince do after the fox tells him a secret?
A．He cares more about a flower and a sheep．
B．He meets many more strange adults on other planets．
C．He realizes his love for the rose and he goes back to his planet．
D．He discovers interesting things such as a snake, other roses and a fox
【单选题】
( ) 28. What does "The little Prince" mainly talk about? It' s about _________．
A．the adult world B．the planet B -612
C．a rose and a fox D．the adventure of a young prince
【单选题】
( ) 29. What is the writer's main purpose（目的）in writing this passage？
A．To tell the readers his life story．
B．To tell people what kind of person his father was．
C．To tell the readers what present he got from his father．
D． To let people know how poor he was．
【单选题】
( ) 30. Why did the father not ask his son not to do this and do that？
A．Because he felt quite confident of his son．
B．Because he was born from a poor family．
C．Because he was a man of few words．
D．Because he didn't want to be much too strict with his son．
【单选题】
( ) 31. What would someone learn from this passage？
A．How to live by oneself． B．How to stand on one's own feet．
C．What a good father should do． D．What the self-important is like．
【单选题】
( ) 32. What may be the proper Chinese for the underlined part in the passage？
A．闲暇时光 B．学费 C．精神空虚 D．经济不足
【单选题】
( ) 33. Why did Natalie Smith pay for the six cars behind her?
A. She had seven tickets.
B. She hoped to please others.
C. She knew the car drivers well.
D. She wanted to show kindness.
【单选题】
( ) 34. Judy Foreman copied down the phrase because she ___ .
A. thought it was beautifully written
B. wanted to know what it really meant
C. decided to write it on a warehouse wall
D. wanted her husband to put it up in the classroom
【单选题】
( ) 35. Who came up with the phrase according to the passage?
A. Judy Foreman. B. Natalie Smith. C. Anne Herbert D. Alice Johnson.
【单选题】
( ) 36. What can we infer from the last paragraph?
A. People should practice random kindness to those in need.
B. People who receive kindness are likely to offer it to others.
C. People should practice random kindness to strangers they meet.
D. People who receive kindness are likely to pay it back to the giver.
【单选题】
( ) 37.The greatest river for navigation is ___________.
A. the Nile B. the Amazon C. the Mekong D. the Mississippi
【单选题】
( ) 38. From a dam, people can use the water for ___________.
A. keeping the rivers clean B. only making electricity
C. irrigation and making electricity D. washing clothes
【单选题】
( ) 39. The water in the river is polluted because of _____________.
A. people's drinking water too much B. people's swimming in the river too much
C. chemicals and other materials D. people's building a dam across a river
【单选题】
( ) 40. The best title of the passage is ___________.
A. Rivers in Cities B. The importance of Rivers
C. Transportation D. Natural Resources
