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提问人：网友zhshjun0825 发布时间：2022-01-07

[主观题]

Among the question of design, construction, and operation remaining to be solved before co

mmercial airliners travel faster than sound is the difficult problem of sonic boom (声震) , the explosive sound generated when an object moves through the air at supersonic speed(超音速).

A sound is a pressure disturbance: a sonic boom, like other explosive sounds, is the result of an abrupt change in pressure. An airplane in subsonic flight produces weak changed in pressure, but because these disturbances travel at the speed of sound, they move faster than the airplane and stay in front of it. In effect, these disturbances warn the air to get out of the way, and the an does just jet, however, gets ahead of its own pressure disturbances. Consequently a wave of suddenly com pressed air--a shock wave--builds up and is thrown off like the wave ;hat spreads from the bow of a speedboat.

Can sonic booms be eliminated？ The answer is a categorical negative--they are an innerent(内在的) part of supersonic flight--but the sonic boom probably can be reduced; government and private research is now under way to improve understanding of the sonic boom. If and when the booms can be reduced to tolerable levels, commercial supersonic transports can come rata service.

Before commercial airliners travel faster than sound, problems must 0e solved regarding ______.

A．design

B．Construction

C．operation

D．all of the above

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更多“Among the question of design, construction, and operation remaining to be solved before co”相关的问题

第1题

Section BDirections: In this section, you will hear 3 short passages. At the end of each p

Section B

Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.

听力原文： Most ants are hard workers and often work from six o'clock in the morning until ten o'clock at night. The work is divided among the worker ants so that each one has a certain amount to do. We do not know how they decide what each one is to do, for they do not talk, some people think ants follow each other by their sense of smell. Ants often live to be one year old, and some have been known to live six or seven years. One way they get their food is from plant lice, which we might call their cows. The ants milk these "cows" by tapping the lice gently until a drop of honey comes out. Then they eat the honey. Ants take very good care of these plant lice and often build a covering over them so that they will be protected from the rain.

(33)

A．One.

B．Few.

C．Several.

D．Many.

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第2题

Take Paragraphs 1-4 in Unit 4 as an example. After raising the ______ “who are the heroes

among us？” in Paragraph 1, the author provides two ______ of civilian heroes in Paragraph 2 and 3. Then in Paragraph 4, the author comes to the ______ that civilians can be heroes too, which is an answer to the question raised in Paragraph 1.

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第3题

News report 3 Question 5 and 7 are based on the news report you have just heard. Question 5

A．International treaties regarding space travel programs．

B．Legal issues involved in commercial space exploration．

C．U．S． government’s approval of private space missions．

D．Competition among public and private space companies．

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第4题

● Read the following passage.● For each question 23-28, choose the correct answer.● Mark o

● Read the following passage.

● For each question 23-28, choose the correct answer.

● Mark one letter (A, B or C) on your Answer sheet.

"GRAY-COLLAR"

For the first time, Shanghai has officially put forward the concept of "gray-collar workers", which refers to technicians with a high-level of creativity and professional skills, in order to encourage more young people to take up these neglected positions.

Twenty-five occupations with 15,000 job positions—such as digital-controlled machine operator and fashion designer—are included in the first batch of "gray collars," mainly in the digital manufacturing industry, according to the Shanghai Labor and Social Security Bureau.

Unlike either white collars like management professionals or blue-collar operation workers, gray collar is a new class of workers with a high educational background and strong practicing ability, officials said.

It is a distinct group and not a transitory class between the white and blue, officials stressed.

"The concept was put forward in accordance with Shanghai's position as the world's center of digital manufacturing, as well as to help solve unemployment among locals, especially youth," said Zhu Junyi, the bureau director.

According to Zhu, some 40 percent of the unemployed in the city are young people who failed to find a steady job after their graduation, which is the second biggest jobless group after middle-aged laid-off workers.

Though an increasing number of local university graduates face great job pressure, many posts, especially those for skilled technicians, are still vacant.

"Most university graduates hope to become white collar workers after graduation, which means there is a big crowd for management positions. But demand for gray collar positions is much larger than the current supply," Zhu said.

In this regard, the Shanghai Career Training and Guidance Center will launch a series of profession al training courses for locals who will become gray collars.

"Gray-collar workers" refer to technicians with all of the following qualities EXCEPT:

A．high-level of creativity

B．high educational background

C．top management ability

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第5题

Woman: Why are you so keen on this newspaper？ Man: It's really the top one among those off

ering inside stories. Question: Why does the man like the newspaper？

A．Because it tells the truth most of the time.

B．Because it provides some background information.

C．Because it is the top one on the list of newspapers.

D．Because it is an inside newspaper.

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第6题

Among the four novels written by Henry James, the one written first in chronological o

A.The Portrait of a Lady

B.The Golden Bowl

C.The Ambassadors

D. The Wing of the Dove

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第7题

Man: Jane, do you know what the faculty members are doing among pizza boxes and soda cans？

Woman: They are making time for the economic and management seminar. Question: What conclusion can we draw from this conversation？

A．The faculty members are having a party.

B．The faculty members have no time to study economics and management.

C．The faculty members are very busy and have no time for the regular meal.

D．The faculty members are making time to do some physical exercises.

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第8题

Section BDirections: In this section, you will hear 3 short passages. At the end of each p

Section B

Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.

(31)

A．The reasons why people don't read newspapers are more complicated than assumed.

B．There are more uneducated people among the wealthy than originally expected.

C．The number of newspaper reader is steadily increasing.

D．There are more nonreaders among young people nowadays.

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第9题

among the following conclusions, the correct one is ____________.

Among the following conclusions, the correct one is ____________.

A、The system is unstable.

B、Link 2 is a redundant restraint.

C、O is an instantaneous joint.

D、O is not an instantaneous joint.

E、The system is stable with no redundant restraints.

F、The system is stable with 1 redundant restraints.

G、The system is instantaneously unstable.

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第10题

？Read the article below about MOO．？Choose the correct word to fill each gap frOm A，B，C o

？Read the article below about MOO．

？Choose the correct word to fill each gap frOm A，B，C or D．

？For each question(21-30)，mark one letter(A，B，C or D)on your Answer Sheet．

One of the most visible locational decisions on．a high technology firm was made by the Microelectronics and Computer Technology Corporation(MCC)．A joint venture of a dozen major computer and semi-conductor firms，MCC was founded to do research (21) advanced level technologies such as new generations of supercomputers，artificial intelligence and robotics． (22) a consortium created in 1982 by several firms，it had no home base or locational inertia，and began its search for a site by examining 57 cities across the country．The cities made polished sales pitches to lure the firm's eventual 400 engineers and scientists．The four finalists in the chase-Atlantis，Austin，San Diego and Raleigh-Durham，in the Research Triangle area of North Carolina， (23) ．was particularly noted for high tech activity．

When Austin was choosen。its attractions to MCC were widely analysed by other would-be Silicon Valleys．Austin，the state capital，iS the site of the main campus of the University of Texas，a school that (24) among the top twenty in the country in research funding．The university's reputation，state commitments of further support，and the city's proven quality of life attractiveness (25) high tech people were the deciding factors．Austin and the State of Texas added to these attractions a package of financial and other incentives，including a favorable lease on land in the university's research park and subsidized mortgages (26) ．relocating employees．

(27) return Austin had got not only the MCC．In the typical snowballing manner of high tech areas，several other companies have decided to move research (28) other advanced technology facilities there．Lockheed Missiles and Space Company，3M Corporation，and Motorola are among the firms which have added to theagglomeration of technical workers there， (29) the expense of cities like Minneapolis and Phoenix，where the companies have other facilities．As a matter of fact，the entire 100 mile corridor between Austin and San Antonio is nicknamed“Silicon Gulch”．San Antonio is the site of several computer biotechnology and electronics companies． (30) the“Gulch”will rival the San Francisco Bay and Boston regions in high technology will depend on its ability to spawn a succession of new firms as technology advances and changes．

(21)

A．of

B．on

C．about

D．to

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第11题

A university has several departments. Each departm...

A university has several departments. Each department has several classes and research institutes. Each research institute has several staff members, among which some professors and associated professors supervise some postgraduates. Each class has several students. Each student can opt several courses and each course can be opted by several students. （1）Create corresponding concept model using noun/verb method. （2）Convert the concept model from Question 1 to corresponding database model, described by tables.

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