更多“进行哪些工作需要将重瓦斯保护改投信号？”相关的问题
由于砷酸在结构和化学性质上都与磷酸类似，很多需要磷酸的酶也能与砷酸结合。然而砷酸的有机化合物的稳定性比类似的磷酸化合物差，会被快速水解。如果用砷酸取代磷酸，对3-磷酸甘油醛脱氢酶催化的反应有何影响？
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“纳米技术”是用（）原子、分子制造物质的科学技术。
A.单个
B.多个
C.特定
D.普遍
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脂肪对婴儿的生理功能主要表现在（）
A.储存能量
B.构成组织细胞的成分
C.保护器官及参与维持体温
D.协助脂溶性物质的吸收和转运
E.提供必需氨基酸
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Directions: There are several passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A), B), C) and D). You should decide on the best choice. Passage One Questions 1 to 5 are based on the following passage. Amid growing news of layoffs, outsourcing, corporate bankruptcies and downsizing, a study finds that feeling insecure about your job takes a toll on physical and mental health — whether you actually lose your job or not. In fact, the health effects of job insecurity are at least as great as the health effects of a serious or life-threatening illness, according to a study of job insecurity and health in the United States that was to be presented on April 1 at the annual meeting of the Population Association of America in Los Angeles. The study is based on an analysis of data from a nationally representative, longitudinal survey conducted by the Institute for Social Research (ISR), and includes information on more than 1,000 men and women under the age of 60 who were interviewed twice, about three years apart. "The strength of this study is that we not only have multiple measures of insecurity but we also have actual measures of job loss," says Sarah Burgard, a sociologist at ISR and the lead author of the study. Since only those who remained employed at both points in time were included in the analysis, the findings are not attributable to health problems related to actual job loss and extended unemployment. About 25 percent of respondents reported feeling insecure about their jobs in at least one of two interviews. And Burgard found that self-rated health was significantly lower for respondents who reported feeling insecure about their jobs. Compared to workers who felt secure at both interviews, those who were chronically insecure were about twice as likely to report physical health that was less than very good or excellent. She also found that private-sector employees were more vulnerable to the negative health effects of job insecurity than were public-sector employees. Job insecurity took a particularly high toll on Black workers, the researchers found. Blacks who were chronically insecure about their jobs were nearly three times as likely as insecure whites and more than four times as likely as secure whites to report very high depressive symptoms. 1. According to the first paragraph, what is exposed by the study? A) Feeling insecure about your job will affect you badly when you have been laid off. B) Feeling insecure about your job exerts a very bad effect on both physical and mental health. C) Feeling insecure about your job, as well as layoffs, outsourcing, corporate bankruptcies and downsizing, will make you collapse physically and mentally. D) The feeling of insecurity is influenced much by the actuality whether you lose your job or not. 2. What is a "longitudinal survey" (in the second paragraph)? A) It is a survey conducted nationally for both men and women. B) It is a survey involving a great number of persons in one country. C) It is a survey concerned with the development of persons over time. D) It is a survey relating to longitude or length. 3. Which one is true among the following statements? A) A serious or life-threatening illness affects a person's health more greatly than a feeling of job insecurity according to some study. B) This study is contributing because it has measured insecurity instead of measuring job loss. C) The analysis of the study includes only those who remained employed at both interviews between which there is an interval of three years. D) The findings of this study indicate clearly the correlation between health problems and job loss. 4. Which inference can't we make from the passage? A) It is possible that less than a quarter of the respondents felt insecure about their job at both interviews. B) Chronical feelings of job insecurity influence negatively worker health. C) It is very likely that those public-sector employees worry less about their jobs than private-sector employees do. D) Blacks generally have more chronical depressive symptoms and other health problems than whites. 5. What is the theme of this passage? A) ISR's role in the job insecurity survey. B) The present health state of the laid-off. C) Worker health being on the edge of collapse. D) Job insecurity taking toll on worker health. Passage Two Questions 6 to 10 are based on the following passage. Modern ideas are beginning to influence the Eskimos, but not enough to make much difference to their way of life. They still spend the winter in igloos, the round huts that are built of snow frozen hard. They still travel on sleds that are pulled by dogs. The winter is too cold for hunting, so during that season they live on the stores of seal meat that they have killed in the summer. But seal meat is not the only kind of food that they eat. In summer they hunt bears and reindeer, a type of deer with long branching horns that is used for its milk, meat and skin. They also fish all the year round. The Eskimos who are hunters in summer are fishermen in winter. In winter they make holes in the ice and catch their fish through the holes that they have made. The Eskimos are adaptable. That is why they are able to live in Arctic regions. 6. Which is the main topic of this passage? A) Modern ideas are beginning to influence the Eskimos. B) Why are the Eskimos able to live in Arctic regions? C) The Eskimos are adaptable. D) Eskimos' way of life has not changed very much. 7. What is the Eskimos' major means of transportation? A) Reindeer. B) Sleds. C) Boats. D) Dogs. 8. In winter the Eskimos ________. A) shut themselves up in igloos B) hunt seals on ice C) fish by making holes in the ice D) raise reindeer for its milk 9. Which is NOT included in the Eskimos' daily diet? A) Fish. B) Milk. C) Animal meat. D) Vegetables. 10. The Eskimos are able to live in Arctic regions because ________. A) they can endure severe living conditions B) they are strong and energetic C) food is abundant there D) they have ways to protect themselves from cold Passage Three Questions 11 to 15 are based on the following passage. The Pentagon, headquarters of the Department of Defense in the US, is one of the world's largest office buildings. It is twice the size of the Merchandise Mart in Chicago, and has three times the floor space of the Empire State Building in New York. The National Capitol could fit into any one of the five wedge-shaped (楔形的) sections. There are very few people throughout the United States who do not have some knowledge of the Pentagon. However, relatively few people have had the opportunity to visit. The Pentagon is virtually a city in itself. Approximately 23,000 employees, both military and civilian, contribute to the planning and execution of the defense of the country. These people arrive daily from Washington D. C. and its suburbs over approximately 30 miles of access highways, including express bus lanes and one of the newest subway systems in the country. They ride past 200 acres of lawn to park approximately 8,770 cars in 16 parking lots; climb 131 stairways or ride 19 escalators to reach offices that occupy 3,705,793 square feet. While in the building, they tell time by 4,200 clocks, drink from 691 water fountains, utilize 284 rest rooms, consume 4,500 cups of coffee, 1,700 pints of milk and 6,800 soft drinks prepared or served by a restaurant staff of 230 persons and dispensed in 1 dinging room, 2 cafeterias, 6 snack bars, and an outdoor snack bar. The restaurant service is a privately run civilian operation under contract to the Pentagon. 11. Which description about the Pentagon is NOT true? A) Very few people in the U.S. know it. B) It is one of the biggest office buildings in the world. C) It is not open to public visits. D) About 23,000 people work in it. 12. People working in the Pentagon are ____. A) all soldiers B) all officials C) all civilians D) not living in it 13. People come to work in the Pentagon most probably ____. A) by car and subway B) by airplane C) by train D) on foot 14. Approximately how many stairways are there in the Pentagon? A) 130. B) 200. C) 250. D) 290. 15. The restaurant in the Pentagon ____. A) is not run by civilians B) is managed by military employees C) is the only place that people can have meals D) subcontracted to civilians by the Pentagon. Passage four Questions 16 to 20 are based on the following passage. Psychologists Juliette H. W. and Tom H. A. at Leiden University wanted to see if the results of previous studies comparing the recall of television and print news information in educated adults would apply to children as well. All the earlier studies found that adults remembered more of what they read than what they saw on television possibly in that adults were much freer to read the printed materials at their convenience. To do this, the researchers designed a study in which 152 children between ages 10 and 12 were presented with five children's news stories, either in their original televised form or in a verbatim (逐字地) printed version. The result was that children who watched the television news reports recalled more of what they viewed than the children who read the printed versions without photos or illustrations. There were some differences, however, the more proficient readers remembered more from either medium than the less proficient readers. Also, the children who watched the televised version recalled more items of information that were presented both verbally and visually than they did with those that were presented only verbally, without accompanying pictures. Noting that the superiority of television as a news medium for children proved to be of a more general nature than they had expected — it was not restricted to certain subgroups of children — the researchers were also pleased to see that the superiority of television was not confi
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某企业为增值税一般纳税人，某日从农民手中收购一批苹果，农产品收购发票上注明的收购价款为80000元，该企业将这一批苹果加工成果汁对外销售，本月取得不含税销售额150000元，此外由于
A.150000×17%+20000÷(1+17%)×17%-80000×11%=19605.98(元)
B.150000×17%+20000÷(1+11%)×11%-80000×11%=18681.98(元)
C.150000×17%+20000×17%80000×11%=20100(元)
D.150000×17%+20000×11%-80000×11%=18900(元)
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Junk Hunting 淘旧货 Anyone who thinks exploration always involves long journeys should have his head examined.Or, better, he should put on his oldest clothes and go off in search of a junk shop. There are three kinds—one full of discarded books, one full of discarded Government equipment, and one full of discarded anything.A junk shop may have four walls and a roof,or it may be no more than a trestle-table in an open air market;but there is one infallible test:no genuine junk shopkeeper will ever pester you to make up your mind and buy something. And you are no true junk shopper if you march purposefully round the shop as if you knew exactly what you wanteD．You must browse, gently chewing the cud of your idle thoughts, and nibbling here and there as a sight or a touch of the goods that lie about you. Yet you must also possess a penetrating glance, darting your eyes about you to spot the treasures that may lurk beneath the rubbish. This is what makes junk shopping such a satisfying voyage of exploration. You never know what interesting and unexpected thing you may discover next. For in a true junk shop, not even the proprietor is always quite sure what his dusty stock conceals. There is always the chance that you may pick up a first edition, a pair of exotic ear-rings, a piece of early Wedgwood china, or a cine camera—and possess it for the price of fifty cigarettes. But this kind of treasure hunt is only a sideline to the true junk shopper. The real attraction lies in finding something that catches your own especial fancy, though everybody else may pass it by. An ancient tarnished clock, whose brass beneath your hands will shine anew; empty boxes that you can see transformed into the framework of a bookcase; an old bound volume of magazines of three-quarters of a century ago, which will shed strange sidelights on the ways our great-grandparents behaved and looked at life. When you begin junk shopping, half the attraction is that you go with absolutely no intention of buying anything. You spend your first couple of Saturday afternoons ambling around among dusty shelves, savouring a page or a chapter as you please, or fingering the piles of oddments that litter counters or tables. At first, be warned, don’t try to buy. You may, indeed you should, ask the price of this and that; but just to give you an idea of what the junk shopkeeper thinks you might be willing to pay him. Later, you will find yourself returning a second and third time to something that has caught your fancy. And when you can hold back no longer, bargaining begins in earnest. This is the other great attraction of the true junk shop. Not only may it hold every conceivable product from every imaginable country; it also transports you to the mediaeval market place or the oriental bazaar, where no price is fixed until buyer and seller have waged a friendly war together, and proved each other’s mettle. And this is where your old clothes become important: let no one take you for a rich connoisseur, or you will find yourself paying a rich man’s prices. And avoid at all costs the suspicion of an American accent, or in spite of the good nature of all good junk shopkeepers, you will be for it.
Anyone who thinks exploration always involves long journeys should have his head examined.Or, better, he should put on his oldest clothes and go off in search of a junk shop. There are three kinds—one full of discarded books, one full of discarded Government equipment, and one full of discarded anything.A junk shop may have four walls and a roof,or it may be no more than a trestle-table in an open air market;but there is one infallible test:no genuine junk shopkeeper will ever pester you to make up your mind and buy something. And you are no true junk shopper if you march purposefully round the shop as if you knew exactly what you wanteD．You must browse, gently chewing the cud of your idle thoughts, and nibbling here and there as a sight or a touch of the goods that lie about you. Yet you must also possess a penetrating glance, darting your eyes about you to spot the treasures that may lurk beneath the rubbish. This is what makes junk shopping such a satisfying voyage of exploration. You never know what interesting and unexpected thing you may discover next. For in a true junk shop, not even the proprietor is always quite sure what his dusty stock conceals. There is always the chance that you may pick up a first edition, a pair of exotic ear-rings, a piece of early Wedgwood china, or a cine camera—and possess it for the price of fifty cigarettes.
But this kind of treasure hunt is only a sideline to the true junk shopper. The real attraction lies in finding something that catches your own especial fancy, though everybody else may pass it by. An ancient tarnished clock, whose brass beneath your hands will shine anew; empty boxes that you can see transformed into the framework of a bookcase; an old bound volume of magazines of three-quarters of a century ago, which will shed strange sidelights on the ways our great-grandparents behaved and looked at life.
When you begin junk shopping, half the attraction is that you go with absolutely no intention of buying anything. You spend your first couple of Saturday afternoons ambling around among dusty shelves, savouring a page or a chapter as you please, or fingering the piles of oddments that litter counters or tables. At first, be warned, don’t try to buy. You may, indeed you should, ask the price of this and that; but just to give you an idea of what the junk shopkeeper thinks you might be willing to pay him.
Later, you will find yourself returning a second and third time to something that has caught your fancy. And when you can hold back no longer, bargaining begins in earnest. This is the other great attraction of the true junk shop. Not only may it hold every conceivable product from every imaginable country; it also transports you to the mediaeval market place or the oriental bazaar, where no price is fixed until buyer and seller have waged a friendly war together, and proved each other’s mettle. And this is where your old clothes become important: let no one take you for a rich connoisseur, or you will find yourself paying a rich man’s prices. And avoid at all costs the suspicion of an American accent, or in spite of the good nature of all good junk shopkeepers, you will be for it.
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因对账表采用计算机编制，冲正报单用符号表示应为()
A、电划报单——3
B、冲正电划报单——11
C、冲正邮划报单——9
D、邮划报单——5
此题为多项选择题。
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粉末中薄壁细胞具椭圆形纹孔、集成纹孔群的中药为
A．三棱
B．泽泻
C．半夏
D．天南星
E．香附
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患者淋巴结特点应为（）。
A.坚硬、无压痛、表面突出
B.稍硬、无压痛、表面光滑
C.稍硬、大小不等、相互粘连
D.橡皮样感、压痛、易推动
E.橡皮样感、无压痛、不易推动
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《煤矿安全规程》规定，在爆破区域内放置和使用爆炸物品的地点，（）m内严禁烟火。
A.10
B.20
C.50
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替喷作业需要（）硬管线，进出口必须在井口两侧，不允许有小于90°的急弯，并要求固定牢靠。
A . A、铁质
B . B、钢质
C . C、铝质
D . D、铜质
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离心泵的效率η与流量qv的关系为（）.
A. qv增大则η增大B. qv增大，η先增大后减小C. qv增大则η减小
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实际批量少于基本批量时，份样数量与份样质量可以按基本批量与实际批量的质量比例递减。
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关于儿童类风湿病，以下不正确的是（）
A.Still型以全身症状起病，病初关节症状不明显，诊断困难
B.RF阴性的多关节型患者易发生关节畸形和强直，多伴抗核抗体阳性
C.少关节型较常见，受累关节一般＜4个，主要为大关节
D.RF阳性多关节型起病缓慢，表现为进行性的多发性关节炎，随后伴明显的X线改变与关节破坏
E.少关节型易并发虹膜睫状体炎，部分患者可累及骶髂关节，甚至发展成为强直性脊柱炎
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有线电视系统包括（）等模式。
A.无干线系统
B.独立前端系统
C.有中心前端系统
D.有远地前端系统
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题目内容
（请给出正确答案）
参考答案
十点题库官方参考答案
（由十点题库聘请的专业题库老师提供的解答）
