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The basic principle of radar is illustrated by what happens when one shouts in a cave. The

echo of the shouting (11)______ the walls helps a person determine the size of the cave. With radar,however,the waves are radio waves instead of (12)______ waves. Radio waves travel (13)______ the speed of light,about300,000 kilometers in a second. A radar set (14)______ a short burst of radio waves. Then it receives the echoes (15)______ when the waves bounce(反射) off objects. By determining the time it (16)______ for the echoes to return to the radar set,a trained technician (17)______ determine the distance between the radar set and other objects. The word“radar”, (18)______ ,gets its name from the term“radio detection and ranging. ”“Ranging”is the term for detection of the (19)______ between an object and the radar set.

Besides being of critical importance to pilot,radar is (20)______ for air traffic control,for tracking ships at sea,and for tracking weather systems and storms.

(11)

A.through

B.for

C.on

D.against.

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更多“The basic principle of radar i…”相关的问题
第1题
The following are basic principles of the Oral Approach EXCEPT______.A. selection principl

The following are basic principles of the Oral Approach EXCEPT______.

A. selection principle

B. gradation selection principle

C. four skills principle

D. presentation principle

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第2题
The Ordinance of 1784 is most significant historically because it embodied the principle t
hat new states should be formed from the western region and admitted to the Union on an equal basis with the original commonwealths. This principle, which underlay the whole later development of the continental United States, was generally accepted by this time and cannot be properly credited to any single man. Thomas Jefferson had presented precisely this idea to his own state of Virginia before the Declaration of Independence, however, and if he did not originate it he was certainly one of those who held it first. It had been basic in his own thinking about the future of the Republic throughout the struggle for independence. He had no desire to break from the British Empire simply to establish an American one--in which the newer region should be subsidiary and tributary to the old. What he dreamed of was an expanding union of self-governing commonwealths, joined as a group of peers.

Which of the following proposals did the Ordinance of 1784 incorporate?

A.New states should be admitted to the Union in numbers equal to the older states.

B.The Union should make the western region into tributary states.

C.New states should share the same rights in the Union as the original states.

D.The great western region should be divided into twelve states.

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第3题
A little more than a century ago, Michael Faraday, the noted British physicist, managed to
gain audience with a group of high government officials, to demonstrate an electro-chemical principle, in the hope of gaining support for his work.

After observing the demonstrations closely, one of the officials remarked bluntly, "It's a fascinating demonstration, young man, but just what practical application will come of this?"

"I don't know," replied Faraday, "but I do know that 100 years from now you'll be taxing them. "

From the demonstration of a principle to the marketing of products derived from that principle is often a long, involved series of steps. The speed and effectiveness with which these steps are taken are closely related to the history of management, the art of getting things done. Just as management applies to the wonders that have evolved from Faraday and other inventors, so it applied some 4, 000 years ago to the workings of the great Egyptian and Mesopotamian import and export firms ... to Hannibal's remarkable feat of crossing the Alps in 218 B.C.with 90, 000 foot soldiers, 12, 000 horsemen and a "conveyor belt" of 40 elephants ... or to the early Christian Church, with its world-shaking concepts of individual freedom and equality.

These ancient innovators were deeply involved in the problems of authority, division of labor, discipline, unity of command, clarity of direction and the other basic factors that are so meaningful to management today. But the real impetus to management as an emerging profession was the Industrial Revolution. Originating in 18-century England, it was triggered by a series of classic inventions and new processes, among them John Kay's Flying Shuttle in 1733, James Hargreaves' Spinning Jenny in 1770, Samuel Crompton's Mule Spinner in 1779 and Edmund Cartwright's Power Loom in 1785.

The anecdote about Michael Faraday indicates that______.

A.politicians tax everything

B.people are skeptical about the values of pure research

C.government should support scientists

D.he was rejected by his government

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第4题
Every year is busy for the Save the Children Fund but 1989 has been especially important.
This independent organization devoted to the welfare of needy children throughout the world is seventy years old. Many children suffered hunger and homelessness at the end of the First World War. Concerned about the plight(困境) of these children, a group of British volunteers founded a new organization in 1919 to publicize the problems and help improve conditions. A founder member, Eglantyne Jebb, drew up the declaration of the "rights of the child", which was adopted by the League of Nations(later the United Nations). This charter(宪章) sums up the philosophy of Save the Children Fund's work. The basic principle is that dignity and well-being are a vital part of the lives of children and a child should be protected regardless of race, nationality or creed(信仰).

In 1989 millions of children throughout the world are still innocent victims of war, famine and poverty. Save the Children Fund is still working to raise public awareness and improve conditions.

Save the Children Fund

Name of organization:【46】

Time of foundation:【47】

Founders: a group of【48】

Aims: publicize the problem and help【49】

Those to be protected: needy children【50】

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第5题
The intelligence test used most often today are based on the work of a Frenchman, Alfred B
i net. In 1905, Binet was asked by the French Ministry of Education to develop a way to identify those children in French schools who were too "mentally deficient (不足的)" to benefit from ordinary schooling and who needed special education. The tests had to distinguish those who were merely be hind in school from those who were actually mentally deficient.

The items that Binet and his colleague Theophile Simon included on the test were chosen on the basis of their ideas about intelligence. Binet and Simon believed intelligence includes such abilities as understanding the meaning of words; solving problems, and making commonsense judgements. Two other important assumptions also shaped Binet' s and Simon' s work. (1) that children with more intelligence will do better in school and (2) that older children have a greater ability than younger children.

Binet' s first test consisted of thirty tasks. They were simple things most children learn as a re ;suit of their everyday experiences. The tasks were arranged in groups, according to age. Binet decided which tasks were appropriate for a given age group by giving them first to a large number of children of different ages. If more than half of the children of a given age passed a test, it was considered appropriate for that age group.

The main purpose of this passage is to ______.

A.tell the origin of intelligence tests

B.explain the basic principle of intelligence tests

C.describe the changes in the content of intelligence tests

D.state the development of intelligence tests

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第6题
The point of the restorationist Critique of preservationism is the claim that it rests on
an unhealthy dualism that conceives nature and humankind as radically distinct and opposed to each other. Dissatisfaction with dualism has "for some time figured prominently in the unhappiness of environmentalists with mainstream industrial society." However, the writings of the restorationists themselves—particularly, William Jordan and Frederick Turner-offer little evidence to support' this accusation. In their view, preservationists are filled with the same basic mind-set as the industrial mainstream, the only difference being that the latter ranks humans over nature while the former elevates nature over humans. While it is perhaps puzzling that Jordan and Turner do not see that there is no logic that requires dualism as a philosophical basis for preservation, more puzzling is the sharpness and ruthlessness of their attack on preservationists, reinforced by the fact that they offer little, if any, criticism of those who have robbed the natural world.

The crucial question, however, about the restorationist outlook has to do with the degree to which the restorationist program is itself faithful to the first principle of restoration: that nature and humanity are fundamentally united rather than separate. Rejecting the old domination model, which sees humans as over nature, restoration theory supports a model of community participation. Yet some of the descriptions that Jordan and Turner give of what restorationists are actually up to—for example, Turner's description of humans as "the lords of creation", or Jordan's statement that "the fate and well being of the biosphere depend ultimately on us and our relationship with it"—are not consistent well with the community—participation model.

Another holistic model namely, that of nature as an organism—might be more serviceable to the restorationists. As with the community model, the "organic" model pictures nature as a system of interconnected parts. A fundamental difference, however, is that in an organism the parts are wholly useful to the life of the organism. If we could think of the biosphere as a single living organism and could identify humans with the brain (or the DNA), or control center, we would have a model that more closely fits the restorationists view.

However, to consider humans as the control center of the living earth is to attribute to them a dominating role in nature. Is this significantly different from the old-fashioned domination model? In both systems humans hold the place of highest authority and power in the world. Also neither view recognizes any limits to the scope and range of reasonable human manipulation in the world. This does not mean that there are no restrictions, only beneficial manipulation, should be undertaken. But it does not mean that nothing is off-limits. A further parallel is that, because the fate of the world rests on humans, they must have a clear idea of what needs to be done. There are also important differences between the two theories. For example, restorationists no longer view the world in the old dominationist way as a passive object. And though both assign to humans a controlling role in the world, dominationists conceive this in terms of conquest while restorationists conceive it in terms of healing. Also, restorationists insist that the ideas which must serve to guide our work in the world are drawn not solely from a consideration of human needs and purposes but from an understanding of the biosphere; as a result, they are more conscious than dominationists of our capacity to human nature.

The author would probably agree that preservationists______.

A.are not critical engugh of those who have robbed the natural world

B.base their ideas on an unhealthy dualism

C.have the same basic mind-set as the industrial mainstream

D.have been unfairly criticized by restorationists

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第7题
Communication games are based on the principle of information gap.()

Communication games are based on the principle of information gap.()

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第8题
加速原理(Acceleration Principle)

加速原理(Acceleration Principle)

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第9题
A.principleB.disciplineC.strategyD.doctrine

A.principle

B.discipline

C.strategy

D.doctrine

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第10题
A.principleB.businessC.cooperationD.policy

A.principle

B.business

C.cooperation

D.policy

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