相关试题
【判断题】
4.在任何情况下，水的离子积都是10－14。( )
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5.在一个平衡体系中，正反应速度等于逆反应速度。( )
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6.氧化-还原反应的实质是化合价的升高或降低。( )
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7. 20mL 1mol/L H2SO4溶液加入到另一种20mL 1mol/L H2SO4溶液中，则混合液浓度为2mol/L。( )
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8.温度对水样电导率的测量没有影响。 ( )
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9. 0.01mol/L氢氧化钠溶液的pH值等于2。 ( )
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10.系统误差可以避免，但偶然误差不能避免。 ( )
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11.热力系统中的CO2主要是由有机物的分解生成的。 ( )
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12.热力除氧器既能除去水中溶解氧，又能除去一部分二氧化碳。 ( )
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13.对于有铜系统来说，锅炉给水进行加氨处理时，应确保汽水系统中含氨量非常低，加氨量不宜过多，否则有引起黄铜腐蚀的可能。 ( )
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14.某溶液的pH=6.5，该溶液呈中性。 ( )
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15.甲基红指示剂变色范围是4.4～6.2。 ( )
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16.循环冷却水系统中的含盐量或离子含量是不变化的。 ( )
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17.锅炉给水加联氨是为了提高其pH值。 ( )
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18.间接碘量法中，淀粉指示剂应在滴定至接近终点时再加入。 ( )
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19.锅炉补给水处理包括预处理和除盐两部分内容。 ( )
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20.凡是能导电的物质称为电解质。 ( )
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21.薄而且坚固、附着力强的氧化物保护膜，保护性强。 ( )
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22.磷酸盐处理既可以防腐，又可以防垢。 ( )
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23.金属在水溶液或潮湿空气中的腐蚀属于电化学腐蚀。 ( )
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24.过热器内沉积的主要是SiO2。 ( )
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25.为防止锅炉内壁结垢，所有锅炉均可采用协调pH-磷酸盐处理。 ( )
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26.相同浓度的各种溶液的电导率相同。 ( )
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27.一级除盐水的SiO2含量应小于100μg/L。 ( )
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28.酸碱指示剂变色的内因是溶液pH值的变化。 ( )
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29.最理想的指示剂恰好在滴定反应的理论终点变色。 ( )
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30.反渗透CA膜对离子价数愈高的电解质除盐效果愈差。 ( )
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31.溶液的活度就是溶液的浓度。 ( )
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32.EDTA是六元酸，在溶液中有七种存在形态。 ( )
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33.直流炉采用Na3PO4处理，主要是防垢。 ( )
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34.如水样中氨含量超过2mg/L，则可用容量法测定。 ( )
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35.采用凝结水精处理的电厂，适合使用碱性水工况。( )
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36.电力生产的指导方针是“安全第一，预防为主”。 ( )
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37.火力发电厂的主要污染物是烟气、废水、粉煤灰和噪声。 ( )
【判断题】
38.同一体积的物体比容越大，表明物质越轻，密度越大，表明物质越重。 ( )
【判断题】
39.在其他条件不变的情况下，升、降温度对化学平衡没有影响。 ( )
【判断题】
40.一种液体在不同的压力下沸点不同。 ( )
【判断题】
41.凡是有温差的物体就一定有热量传递。 ( )
【判断题】
42.随沸腾和加热时间的延长，水的温度是逐渐升高的。 ( )
【判断题】
43.化学分析时可以使用没有标签的药品。 ( )
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
