To fight a noise by making more noise sounds strange, but th..

第1题

英译中But it is a little upsetting to read in the explanatory notes that a certain

英译中

But it is a little upsetting to read in the explanatory notes that a certain line describes a fight between a Turkish and a Bulgarian officer on a bridge off which they both fall into the river--and then to find that the line consists of the noise of their falling and the weights of the officers, "Pluff! Pluff! A hundred and eighty-five kilograms."

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第2题

D To fight a noise by making more noise sounds strange, but that ' s exactly what motor e

D

To fight a noise by making more noise sounds strange, but that ' s exactly what motor engi-

neers are doing in Germany and some other countries.

Carmaker ' s research and development laboratories have already proved that mixing more noise

with the help of loudspeakers can reduce the unwanted noise. Physicists have known about the tech-

nique for a long time. Sound is made up of pressure waves in the air. If two sound waves' of the

same frequency(频率） mix so that the highest point of one wave happens at the same time as the'

lowest point of the other wave, the result is no sound. Therefore, by producing a perfect copy of

the noise and delaying it by half a wave cycle(周期) ,we can kill the unwanted noise. Using this

technique many carmakers are racing to develop noise killing systems(系统) borh inside and outside

the cars.

Another good thing about the use of noise killing systems is that it saves the need for a silencer; this not only reduces the weight of a car, but also makes the motor bum less fuel and work better. Sorpe engineers believe that the noise killing system will be used in most cars within a few

years. But the carmakers haven' t decided if they will carry it into production because it would add several hundred dollars to the cost of their cars.

69. Which of the following gives a general idea of how the noise killing system works？

[ A]By producing pressure waves going in the opposite direction.

[ B ] By mixing high frequency sound waves with .low frequency sound waves.

[C]By mixing new sound waves with the noise and sending them out together.

[D]By making copies of the unwanted sound waves and letting them out a little later.

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第3题

根据以下材料回答题

To fight a noise by making more noise sounds strange, but that' s exactly what motor engi-neers are doing in Germany and some other countries．

Carmaker' s research and development laboratories have already proved that mixing more noisewith the help of loudspeakers can reduce the unwanted noise．Physicists have known about thetechnique for a long time．Sound is made up of pressure waves in the air．If two sound waves ofthe same frequency(频率) mix so that the highest point of one wave happens at the same time asthe lowest point of the other wave, the result is no sound．Therefore, by producing a perfect copyof the noise and delaying it by half a wave cycle (周期), we can kill the unwanted noise．Usingthis technique many carmakers are racing to develop noise killing systems (系统) both inside andoutside the cars．

Another good thing about the use of noise killing systems is that it saves the need for a silencer;this not only reduces the weight of a car, but also makes the motor burn less fuel and work better．

Some engineers believe that the noise killing system will be used in most cars within a fewyears．But the carmakers haven' t decided if they will carry it into production because it would addseveral hundred dollars to the cost of their cars．

Which of the following gives a general idea of how the noise killing system works？查看材料

A.By producing pressure waves going in the opposite direction．

B.By mixing high frequency sound waves with low frequency sound waves．

C.By mixing new sound waves with the noise and sending them out together．

D.By making copies of the unwanted sound waves and letting them out a little later．

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第4题

To fight a noise by making more noise sounds strange ,but that's exactly what motor engine

ers are doing in Germany and some other countries.

Car makers' research and development laboratories have already proved that mixing more noise with the help of loudspeakers can reduce the unwanted noise.

Physicists have known about the technique for a long time. Sound is made up of pressure waves in the air. If two sound waves of the same frequency(频率) mix so that the highest point of one wave happens at the same time as the lowest point of the other wave, the result is no sound. Therefore ,by producing a perfect copy of the noise and delaying it by half a wave cycle(周期), we can kill the unwanted noise. Using this technique many carmakers are racing to develop noise-killing systems(系统)both inside and outside the cars.

Another good thing about the use of noise-killing systems is that it saves the need for a silencer; this not only reduces the weight of a car, but also makes the motor burn less fuel and work better.

Some engineers believe that the noise-killing system will be used in most cars within a few years. But the carmakers haven't decided if they will carry it into production because it would add several hundred dollars to the cost of their cars.

Which of the following gives a general idea of how the noise-killing system works？

A．By producing pressure waves going in the opposite direction.

B．By mixing high frequency sound waves with low frequency sound waves.

C．By mixing new sound waves with the noise and sending them out together.

D．By making copies of the unwanted sound waves and letting them out a little later.

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第5题

When a new movement in art attains a certain fashion, it is advisable to find out what its

advocates are aiming at, for, however farfetched and unreasonable their principles may seem today, it is possible that in years to come they may be regarded as normal. With regard to Futurist poetry, however, the case is rather difficult, for whatever Futurist poetry may be—even admitting that the theory on which it is based may be right—it can hardly be classed as Literature.

This, in brief, is what the futurist says: for a century, past conditions of life have been conditionally speeding up, till now we live in a world of noise and violence and speed. Consequently, our feelings, thoughts, and emotions have undergone a corresponding change. This speeding up of life, says the futurist, requires a new form. of expression. We must speed up our literature too, if we want to interpret modern press. We must pour out a large stream of essential words, unhampered by stops, or qualifying adjectives, or finite verbs. Instead of describing sounds we must make up words that imitate them; we must use many sizes of type and different colored ink on the same page, and shorten or lengthen words at will.

Certainly their description of battles are confused, But it is a little upsetting to read in the explanatory notes that a certain line describes a fight between a Turkish and a Bulgarian on a bridge off which they both fall into the river—and then to find that the line consists of the noise of their falling and the weights of the officers: "Pluff! Huff! A hundred and eighty-five kilograms".

This, though it fills the law and requirements of Futurist poetry, can hardly be classed as Literature. All the same, no thinking man can refuse to accept their first proposition: that a great change in our emotional life calls for a change of expression. The whole question is really this: have we essentially changed？

This passage is mainly about ______.

A．a survey of new approaches to art

B．a review of Futurist poetry

C．about the merits of Futurist poetry

D．about laws and requirements of literature

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第6题

Listening out for whale song is one way that ships can avoid colliding with whales. But wh

at do you do if the whales aren't singing？ One answer, developed by researchers in the Canary Islands, is to focus on the way the giant creatures mask the clamour of ocean noise.

No one knows how many whales are killed by ships each year, but collisions are thought to ac- count for up to a third of unnatural deaths. For the northern right whale, this means one or two individuals every year, and with only 300 animals left, that's an unacceptable loss. There are three global hot spots for whale collisions: northern right whales are at risk in the Atlantic off the east coast of the US and Canada, fin whales in the Mediterranean, and sperm whales off the Canary Islands.

Last year, the Massachusetts-based international Fund for Animal Welfare attached hydro- phones to buoys and successfully listened out for right whale song in the North Atlantic. But since right whales remain silent for hours at a time, and sperm whales are silent for around haft the time, a better tracking technology is needed.

The new Whale Anti-Collision System (WACS), developed by Michel Andre, is designed to help ships in these hot spots steer clear of the whales. It uses a sonar technique called ambient noise imaging to locate the animals even when they are silent.

To do this, Andre has been testing a long lines of buoys, each bristling with 32 sensitive under- water microphones, or hydrophones, that pick up sea sounds such as breaking waves, rain and ship- ping noise. Any approaching whale blocks this background noise and creates a detectable "sound shadow".

By comparing the reflections received from the hydrophones on different buoys, Andre's system can gather enough information to work out the whale' s position and how fast it is moving. Software displays the results, on a 3D colour map. Underwater objects stand out like hot spots on a thermal image. In trials planned for next year, Andre will place two lines of 12 spherical buoys along the 120-kilometre ferry route between the islands of Tenerife and Gran Canaria. The signals will be sent to a land station where they will be analysed to create a 3D picture of the sea in real time.

If the trials are successful, the WACS software could be installed aboard ferries so that ships' masters can steer clear of whales. Failing that, the whales' movements could be tracked from shore- based installation and radioed to ships in the area.

The loss of one or two northern fight whales every year is considered an unaeeeptable loss because they ______.

A．are the only Whales that can sing songs

B．are the only whales capable of masking the clamour of ocean noise

C．provide clues to scientists to study sea currents and waves

D．are on the very verge of distinction

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第7题

To fight against computer crimes, a computer system needs a sure way of identifying its ri

ght users and rejecting those who are not entitled to use it. The identification system should be quick, simple, and convenient.

At present, signatures are widely used to identify credit card holders, but it takes an expert to detect a good forgery. Sometimes even a human expert is fooled, and there is no reason to believe that a computer could do any better.

Photographs are also sometimes used for identification. But, people find it inconvenient to stop by a credit-card company and to be photographed. Companies might lose business if they made the pictures under absolute requirement. Also, photographs are less useful these days, when people frequently change their appearance by changing the way they wear their hair. Finally, computer programs for analyzing photographs are still highly experimental.

Cash-drawing systems often use two identification numbers: One is recorded on a magnetic stripe on the identification cards, and the other is given to the CRS holder. When the user inserts his card into the cash-drawing terminal, he keys in the identification number he has been given. The computer checks to see that the number recorded on the card and the other keyed in by the user refer to the same person.

For a long time, fingerprints have provided a method of positive identification. But they suffer from two problems. One is that there is no simple system for comparing fingerprints electronically, the other is that because most people associate being fingerprinted with being arrested; they almost surely would resist being fingerprinted for routine identification.

Voiceprints have been suggested. With these, the user has only to speak a few words for the computer to analyze his voice. There are no psychological problems here. And technically it's easier to take and analyze voiceprints than fingerprints. However, it has yet to be proved that the computer cannot be fooled by imitation. Also, the voice is subjected to the noise and distortion of a telephone line.

Even lipprints have been suggested. But it's doubtful that kissing computers will ever catch on.

Which of the following is NOT mentioned as one of the identification system requirements？

A．Convenience.

B．Reliability.

C．Low costs.

D．Acceptability.

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第8题

Quite apart from any awkwardness in the way he handled the hostile bid by rival Oracle for

the firm he was running, Craig Conway seems to have been an unpopular CEO of PeopleSoft, a large enterprise-software company. Three managers who reported directly to him were apparently close to resigning in frustration, and the board was unhappy about "misstatements" he made to analysts. So even though there was no "smoking gun", as the board put it, Mr. Conway was fired on October 1st and replaced by the firm's founder, David Duffield.

Mr. Duffield's brief is now to address Mr. Conway's perceived shortcomings and his obsession with fending off the $7.7 billion takeover bid from Oracle. At the same time, says Paul Hamerman of Forrester, a research firm, Mr. Conway offered no compelling technological vision for PeopleSoft, and seemed deaf to "quite a noise level of customer complaints". Mr. Conway's firing prompted much speculation that PeopleSoft might now be more prepared to negotiate with Oracle rather than fight it. But PeopleSoft insists that both Mr. Duffield and the board focus on a long-term strategy for the company, not a quick sale.

On the same day that Mr. Conway was fired, however, Oracle scored another victory when America's Justice Department said that it would not appeal against a judge's decision to allow the takeover on antitrust grounds. So, this week, the battle moved to another courtroom, in Delaware, where both companies are registered. In this suit, Oracle is claiming that People. Soft is not properly looking after the interests of its shareholders by using a "poison pill" and a "customer assurance programme" to keep Oracle at bay.

The poison pill is a very common provision, and one that PeopleSoft has had for almost a decade. It floods the market with new shares if a predator buys more than 20% of PeopleSoft's equity, thus making an acquisition very difficult. The customer-rebate programme, by contrast, was put in place last June. It guarantees that any PeopleSoft client can get a refund for between two and five times its software-licence fee if support for that software is ever cut off. To Oracle, this represents another dirty tactic, since it amounts to a potential liability of more than $2 billion. To PeopleSoft, however, it was not only fair but necessary to retain customers, since Oracle said at the time of its bid that it planned to kill PeopleSoft's products and switch clients to its own. The two companies' lawyers are likely to be at it for another few weeks, which could yet see a higher bid from Oracle.

According to the passage, Craig Conway

A．tactfully handled oracle's hostile bid.

B．induced the resign of his three managers.

C．ignored customers' grievances.

D．is technologically illiterate.

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第9题

噪声控制noise control

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第10题

高频噪声high-frequency noise

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