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簡述交流伺服系統的調試過程。

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試題分類: 施工員
練習次數:0次
The discovery of the Antarctic not only proved one of the most interesting of all geographical adventures, but created what might be called “the heroic age of Antarctic exploration”. By their tremendous heroism, men such as Shakleton, Scott, and Amundsen caused a new continent to emerge from the shadows, and yet that heroic age, little more than a century old, is already passing. Modern science and inventions are revolutionizing the endurance, future journeys into these icy wastes will probably depend on motor vehicles equipped with caterpillar traction rather than on the dogsthat earlier discoverers found so invaluable and hardly comparable. Few realize that this Antarctic continent is almost equal in size to South America, and enormous field of work awaits geographers and prospectors. The coasts of this continent remain to be accurately charted, and the maping of the whole of the interior presents a formidable task to the cartographers who undertake the work. Once their labors are completed, it will be possible to prospect the vast natural resources which scientists believe will furnish one of the largest treasure hoards of metals and minerals the world has yet known, and almost inexhaustible sources of copper,coal, uranium, and many other ores will become available to man. Such discoveries will usher in an era of practical exploitation of the Antarctic wastes. The polar darkness which hides this continent for the six winter months will be defeated by huge batteries of light, and make possible the establishing of air-fields for the future inter-continental air services by making these areas as light as day. Present flying routes will be completely changed, for the Antarctic refueling bases will make flights from Australia to South America comparatively easy over the 5,000 miles journey. The climate is not likely to offer an insuperable problem, for the explorer Admiral Byrd has shown that the climate is possible even for men completely untrained for expeditions into those frozen wastes. Some of his parties were men who had never seen snow before, and yet he records that they survived the rigors of the Antarctic climate comfortably, so that, provided that the appropriate installations are made, we may assume that human beings from all countries could live there safely. Byrd even affirms that it is probably the most healthy climate in the world, for the intense cold of thousands of years has sterilize this continent, and rendered it absolutely germfree, with the consequences that ordinary and extraordinary sickness and diseases from which man suffers in other zones with different climates are here utterly unknown. There exist no problems of conservation and preservation of food supplies, for the latter keep indefinitely without any signs of deterioration; it may even be that later generations will come to regard the Antarctic as the natural storehouse for the whole world. Plans are already on foot to set up permanent bases on the shores of this continent, and what so few years ago was regarded as a “dead continent” now promises to be a most active center of human life and endeavor. 1.When did man begin to explore the Antarctic? A.About 100years ago. B.In this century. C.At the beginning of the 19th century. D.In 1798. 2.What must the explorers be, even though they have modern equipment and techniques? A.Brave and tough B.Stubborn and arrogant. C.Well-liked and humorous. D.Stout and smart. 3.The most healthy climate in the world is___. A.in South America. B.in the Arctic Region. C.in the Antarctic Continent. D.in the Atlantic Ocean. 4.What kind of metals and minerals can we find in the Antarctic? A.Magnetite, coal and ores. B.Copper, coal and uranium. C.Silver, natural gas and uranium. D.Aluminum, copper and natural gas. 5.What is planned for the continent? A.Building dams along the coasts. B.Setting up several summer resorts along the coasts. C.Mapping the coast and whole territory. D.Setting up permanent bases on the coasts.
試題分類: 大學英語六級
練習次數:2次
Passage 3 Questions 11 to 15 are based on the following passage: The cowboy is the hero of many movies,. He is, even today, a symbol of courage and adventure. But what was the life of the cowboy really like? The cowboy’s job is clear from the word cowboy. Cowboy were men who took care of cows and other cattle. The cattle were in the West and in Texas. People in the cities of the East wanted beef these cattle. Trains could take the cattle east. But first the cattle had to get to the trains. Part of the cowboy’s job was to take the cattle hundreds of miles to the railroad town. The trips were called cattle drivers. A cattle drive usually took several months. Cowboys rode for sixteen hours a day. Because they rode so much, each cowboy brought along about eight horses. A cowboy changed horses several times each day. The cowboys had to make sure that cattle arrived safely. Before starting on a drive, the cowboys branded the cattle. They burned a mark on the cattle to show who they belonged to. But these marks didn’t stop rustlers, or cattle thieves. Cowboys had to protect the cattle from rustlers. Rustlers made the dangerous trip even more dangerous. Even though their work was very difficult and dangerous, cowboys did not earn much money. They were paid badly. Yet cowboys liked their way of life. They lived in a wild and open country. They lived a life of adventure and freedom. 11. A cowboy is a symbol of . A. courage and adventure B. a hard life and big pay C. movies in the past D. cows and other cattle 12. The cowboys’ job was . A. to be a hero in real life B. to be a hero of the movie C. to take care of cattle D. to be a dangerous rustler 13. During a cattle driver, cowboys took a group of cows from a wild and open country to . A. the West states and Texas B. the cities of the East States C. the people who eat beef in cities D. the railroad towns hundred miles away 14. On their way of cattle drivers, the cowboys protected the cattle by . A. burning a mark on their cows B. keeping an eye on cattle thieves C. making the trip more dangerous D. looking after eight cows each person 15. Cowboys enjoyed themselves because . A. they liked their way of life B. they made a lot of money C. they had a vary difficult job D. they were heroes in movies
試題分類: 大學英語四級
練習次數:1次
試題分類: 資料員
練習次數:1次
Passage 3 Questions 11 to 15 are based on the following passage: The idea of a special day to honor mothers was first put forward in America in 1907. two years later a woman, Mrs. John Bruce Dodd, in the state of Washington proposed a similar day to honor the head of the family—the father. Her mother died when she was very young, and her father brought her up. She loved her father very much. In response to Mrs. Dodd’s idea that same year—1909, the state governor of Washington proclaimed (宣布) the third Sunday in June Father’s Day. The idea was officially approved by President Woodrow Wilson in 1916. in 1924, President Calvin Coolidge recommended national observance of the occasion “to establish more intimate (親密) relations between fathers and their children, and to impress upon fathers the full measure of their obligations.” The red or white rose is recognized as the official Father’s Day flower. Father’s Day took longer to establish on a national scale than Mother’s Day, but as the idea grained popularity, tradesmen and manufacturers began to see the commercial possibilities. They encouraged sons and daughters to honor their fathers with small thank-you presents, such as a tie or pair of socks, as well as by sending greeting cards. During the Second World War, American servicemen stationed in Britain began to request Father’s Day greeting cards to send home. This generated a response with British card publishers. Though at first the British public was slow to accept this rather artificial day, it’s now well celebrated in Britain on the third Sunday in June in much the same way as in America. Father’s Day seems to be much less important as occasion than the Mother’s Day. Not many of the children offer their fathers some presents. But the American fathers still think they are much better fated than the fathers of many other countries, who have not even a day for their sake in name only. 11. When did Father’s Day officially begin to have national popularity? A. 1907 B. 1909 C. 1916 D. 1924 12. Who first started the idea of holding the Father’s Day? A. Mrs. John Bruce Dodd B. Mrs. John Bruce’s Mother C. The government of Washington. D. Some businessmen. 13. What flower will be popular on Father’s Day? A. Lily B. Water Lily C. Red rose or white rose D. Sunflower. 14. Which statement is true, a according to this passage? A. It took even longer for Mother’s Day to gain national popularity. B. The businessmen helped to make Father’s Day popular. C. Father’s Day is only celebrated in America. D. Father’s Day is only a trick of the businessmen to make money. 15. What was the first reaction of the British publishing towards Father’s Day? A. They thought highly of it and accepted it at once. B. They just accepted it at once without any hesitation. C. They just thought it a joke. D. They thought it was too artificial and took a long time to accept.
試題分類: 大學英語四級
練習次數:1次
試題分類: 社區工作人員
練習次數:0次
If the old maxim that the customer is always right still has meaning, then the airlines that ply the world’s busiest air route between London and Paris have a flight on their hands. The Eurostar train service linking the UK and French capitals via the Channel Tunnel is winning customers in increasing numbers. In late May, it carried its one millionth passenger, having run only a limited service between London, Paris and Brussels since November 1994, starting with two trains a day in each direction to Paris and Brussels. By 1997, the company believes that it will be carrying ten million passengers a year, and continue to grow from there. From July, Eurostar steps its service to nine trains each way between London and Paris, and five between London and Brussels. Each train carries almost 800 passengers, 210 of them in first class. The airlines estimate that they will initially lose around 15%-20% of their London-Paris traffic to the railways once Eurostar starts a full service later this year (1995), with 15 trains a day each way. A similar service will start to Brussels. The damage will be limited, however, the airlines believe, with passenger numbers returning to previous levels within two to three years. In the short term, the damage caused by the 1 million people-levels traveling between London and Paris and Brussels on Eurostar trains means that some air services are already suffering. Some of the major carriers say that their passenger numbers are down by less than 5% and point to their rivals-Particularly Air France-as having suffered the problems. On the Brussels route, the railway company had less success, and the airlines report anything from around a 5% drop to no visible decline in traffic. The airlines’ optimism on returning traffic levels is based on historical precedent. British Midland, for example, points to its experience on Heathrow Leeds Bradford service which saw passenger numbers fold by 15% when British Rail electrified and modernized the railway line between London and Yorkshire. Two years later, travel had risen between the two destinations to the point where the airline was carrying record numbers of passengers. 1.British airlines confide in the fact that__. A.they are more powerful than other European airlines. B.their total loss won’t go beyond a drop of 5% passengers. C.their traffic levels will return in 2-3 years. D.traveling by rail can never catch up with traveling by air. 2.The author’s attitude towards the drop of passengers may be described as__. A.worried.B.delightedC.puzzled.D.unrivaled. 3.In the passage, British Rail (Para 6) is mentioned to__. A.provide a comparison with Eurostar. B.support the airlines’ optimism. C.prove the inevitable drop of air passengers. D.call for electrification and modernization of the railway. 4.The railway’s Brussels route is brought forth to show that__. A.the Eurostar train service is not doing good business. B.the airlines can well compete with the railway. C.the Eurostar train service only caused little damage. D.only some airlines, such as Air France, are suffering. 5.The passage is taken from the first of an essay, from which we may well predict that in the following part the author is going to__. A.praise the airlines’ clear-mindedness. B.warn the airlines of high-speed rail services. C.propose a reduction of London/Paris flights. D.advise the airlines to follow British Midland as their model.
試題分類: 大學英語六級
練習次數:8次
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