轨道车与接触网作业车行车安全装备主要包括哪些设备?
轨道车与接触网作业车行车安全装备主要包括列车运行监控记录装置(简称监控装置)、机车自动停车装置(简称自停装置)、机车信号、列车无线调度通信设备(简称无线列调)以及与之配套的传感、信息输入、信息输出和连接设备等。
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Part IV Translation:
One of them was from my school days, when our ninth grade teacher, Miss Raber, would pick out words from the Reader’s Digest to test our vocabulary. (Passage Four)
失业和就业的基本概念是什么?
The food we eat seems to have profound effects on our health. Although science has made enormous steps in making food more fit to eat, it has , atthe same time, made many foods unfit to eat. Some research has shown that perhaps eighty percent of cancer is related to the diet as well, especially cancer the colon . Different cultures are more prone to contract certain illnesses because of the food that is characteristic in these cultures. That food related to llness is not a new discovery. In 1945 , government researchers realized that itrates and nitrites, commonly used to preserve color in meats, and other food dditives, caused cancer. Yet, these carcinogenic additives remain in our food, nd it becomes more difficult all the time to know which things on the pack ging labels of processed food are helpful or harmful.The additives which we eat are not all so direct. Farmers often give penicillin to beef and poultry, and because of this, penicillin has been found in the milk of treated cows. Sometimes similar drugs are administered to animals not for medicinal purposes, but for financial reasons. The farmers are simply trying to fatten the animals in order to obtain a higher price on the market. Although the Food and Drug Administration (FDA) has tried repeatedly to controlthese procedures, the practices continue.
48. What is the main topic of the passage?
A. Food and our health
B Food and additives
C. Food and cancer
D Food and culture
49 All of the following statements are true EXCEPT_______.
A Forty percent of cancer is caused by problems related to food.
B Researchers have known about the potential danger of food additivesfor many years
C. We eat some of the food additives directly and some indirectly
D Drugs are always given to animals for medicinal purposes
50. Why do farmers give drugs to their animals?
A. to speed up the growth of animals
B To make theanimals fatter
C to make the animals ’ meat fit to eat
D To make the animals’ meat rich in nutrients
51. It can be inferred from the passage that_________.
A scientist have made all the food fit to eat
B only in recent years have people found that the food is related to one’s illness
C all kinds of cancer are related to the diet
D some additives are harmful to our health
52. The word “ this ”in the second sentence of paragraph 2 most probablyrefers to __________.
A farmer
B penicillin
C beef and poultry
D the fact that farmers often give penicillin to a beef
简述安全检查的目的及任务?
家庭可支配收入是指什么?
Directions:
In this section you will hear a recorded short passage.The passage is printed in the test paper, but with some words or phrases missing. The passage will be read two times. You are required to put the missing words or phrases on the Answer Sheet in order of the numbered blanks according to what you hear. I think we'll mbegin now. First I'd like to welcome you all and thank you for your coming, especially at such short notice. I know you are all very busy and it's difficult to take time away from your ______ for meetings.As you can see on the agenda,today we will focus on the upcoming______.First we'll discuss the groups that will be coming in from Germany. After that, we'll discuss the North American Tours, ______ by the Asian tours. If time ______, we will also discuss the Australian tours which are booked for early September. Finally, I'm going to request some feedback from all of you ______ last year's tours and where you think we can improve.
用于混凝土、砌筑砂浆的常用水泥、用于砌筑砂浆的砌筑水泥及抹灰用水泥,它们的必试项目有什么不同?
低压电力电缆敷设前应做哪些检查和试验?
值班员和非值班员巡视高压设备应注意哪些事项?
Scattered through the seas of the world are billions of tons of small plants and animals called plankton. Most of these plants and animals are too small for the human eye to see. They drift about lazily with the currents, providing a basic food for many larger animals. Plankton has been described as the equivalent of the grasses that grow on the dry land continents, and the comparison is an appropriate one. In potential food value however, plankton far outweighs that of the land grasses. One scientist has estimated that while grasses of the world produce about 49 billion tons of valuable carbohydrates each year. The sea’s plankton generates more than twice as much.
Despite its enormous food potential, little effort was made until recently to farm plankton as we farm grasses on land. Now marine scientists have at last begun to study this possibility, especially as the sea’s resources loom even more important as a means of feeding an expanding world population.
No one yet has seriously suggested that “planktonburgers” may soon become popular around the world. As a possible farmed supplementary food source, however, plankton is gaining considerable interest among marine scientists.
One type of plankton that seems to have great harvest possibilities is a tiny shrimplike creature called krill. Growing to two or three inches long, krill provide the major food for the giant blue whale, the largest animal ever to inhabit the Earth. Realizing that this whale may grow 100 feet and weigh 150 tons at maturity, it is not surprising that each one devours more than one ton of krill daily.
Krill swim about just below the surface in huge schools sometimes miles wide, mainly in the cold Antarctic. Because of their pink color, they often appear as a solid reddish mass when viewed from a ship or from the air. Krill are very high in food value. A pound of these crustaceans contains about 460 calories—about the same as shrimp or lobster, to which they are related.
If the krill can feed such huge creatures as whales, many scientists reason, they must certainly be contenders as new food source for humans.
1.Which of the following best portrays the organization of the passage?
A.The author presents the advantages and disadvantages of plankton as a food source.
B.The author quotes public opinion to support the argument for farming plankton.
C.The author classifies the different food sources according to amount of carbohydrate.
D.The author makes a general statement about plankton as a food source and then moves to a specific example.
2.According to the passage, why is plankton regarded to be more valuable than land grasses?
A.It is easier to cultivate.
B.It produces more carbohydrates.
C.It does not require soil.
D.It is more palatable.
3.Why does the author mention “planktonburgers”?
A.To describe the appearance of one type of plankton.
B.To illustrate how much plankton a whale consumes.
C.To suggest plankton as a possible food sources.
D.To compare the food values of beef and plankton.
4.What is mentioned as one conspicuous feature of krill?
A.They are the smallest marine animals.
B.They are pink in color.
C.They are similar in size to lobsters.
D.They have grass like bodies.
5.The author mentions all of the following as reasons why plankton could be considered a human food source except that it is ___.
A.high in food value.
B.in abundant supply in the oceans.
C.an appropriate food for other animals.
D.free of chemicals and pollutants.