相关试题
【判断题】
离心泵工作时，管路堵塞会引起电机超负荷。
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强碱阴离子交换树脂的最高可耐受温度是60℃。
【判断题】
天然水中化学需氧量越大，说明其受到无机物污染越严重。
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所谓的水的纯度是指水的清净程度，可用水中各种悬浮物和胶体等杂质的总含量来衡量。
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止回阀一般用于清净的流体介质中，不宜用于含固体颗粒和黏度大的流体介质。
【判断题】
化学水处理站和凝结水处理站均设置5台混床设备。
【判断题】
为了便于检修，止回阀一般安装在水泵和出口阀之间。
【判断题】
胶体物质也可由大颗粒的难溶物质破碎后而形成。
【判断题】
离心泵的二级保养周期为运行168小时。
【判断题】
化学水处理站的设计处理规模为1000t/h。
【判断题】
由于凝结水处理站的制水量受外界因素影响较大，因此装置主要依靠调节化学水处理站的运行负荷确保外供除盐水量满足全厂使用要求。
【判断题】
凝结水处理站回收的凝液包括工艺冷凝液和透平冷凝液。
【判断题】
化学水处理站和凝结水处理站均设有高效过滤器。
【判断题】
正常情况下，凝结水处理站的进水水质优于化学水处理站。
【判断题】
判断蒸汽凝液是否具备回收条件的关键水质指标是含油量和TOC。
【判断题】
逆流再生时，中间配水装置以上的树脂也起离子交换作用。
【判断题】
阳离子交换器失效，会出现电导率暂时上升现象。
【判断题】
水泵运行时，叶轮两侧承受的压力不平衡，是产生轴向推力的主要原因。
【判断题】
进水的含盐量和树脂的再生程度对混床的出水水质和运行周期都有很大影响。
【判断题】
离心泵出口阀开度变小则泵的流量下降，电流下降。
【判断题】
化学水装置的混床再生时，阴阳离子交换树脂呈混合状态。
【判断题】
化学水装置的混床再生时，反洗步序的主要作用是冲出床层中截留的杂质。
【判断题】
因为阴离子交换树脂耐热性能好，所以在再生阴树脂时常采用伴热
【判断题】
化学水装置的混床再生时，通入压缩空气的主要作用是促进树脂颗粒摩擦，使树脂颗粒上附着的污染物脱落。
【判断题】
化学水装置混床再生时，盐酸从离子交换器的下部加注，碱液从离子交换器的上部加注。
【判断题】
若某种离子容易与树脂结合，则也容易被置换下来。
【判断题】
只需监督混床出水电导率，就可控制混床的失效点。
【判断题】
再生三要素是再生时间、再生流速、再生浓度。
【判断题】
化学平衡时，如果增加反应物的浓度，可以破坏它的平衡。
【判断题】
在标准状况下，每摩尔的任何气体的体积都是22.4升。
【判断题】
提高水温，可以降低氧气在水中的溶解量。
【判断题】
切换水泵时，应先启动备用泵，运行正常后，再停欲停水泵，然后调节负荷至所需。
【判断题】
为提高低温水的混凝效果常用的方法是增大加药量和投加高分子助凝剂。
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
