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A.人双眼观察物体的角度相同，因此能够辨别物体远近，产生立体视觉
B.人双眼观察物体的角度略有差异，因此能够辨别物体远近，产生立体视觉
C.人双眼观察物体的角度差异很大，因此能够辨别物体远近，产生立体视觉
D.人双眼观察物体的角度相反，因此能够辨别物体远近，产生立体视觉
答案
B、人双眼观察物体的角度略有差异，因此能够辨别物体远近，产生立体视觉
更多“3D是Three—dimensional的缩写，意为三维。3D电视利用某一原理，把左右眼看到的影像分离，从而使观看者看到三维立体影像。这一原理是_____。”相关的问题
第1题
听力原文： Prince is a major racket goods sporting company. We make tennis, squash, badminton rackets, apparel and footwear. We also sell the accessories to those products which include strings, grips and sport bags, and other accessory products as well. Prince is headquartered in Bordentown, New Jersey, which is just a little bit south of Trenton, New Jersey, and just a little bit north of Philadelphia. We also have offices in Europe, in Treviso, Italy. We have an office in Singapore which coordinates the Asian theater for us. And then we have distributors scattered throughout the world.
In 1989 we were acquired by the Benetton Sports System. Benetton Sports System is comprised of a number of different companies but an easy illustration would be to think of an umbrella and the umbrella would be the Benetton Sports System. Underneath the umbrella would be three columns: one column would be Rollerblade, which is the in-line skating company; another column would be Nordica, which is the winter sport group; and the third column would be Prince Sports Group, which is our company, which deals with the summer sporting goods. And then they are all connected across the bottom by Benetton Sports System Active that is responsible for the apparel for all three of those groups.
Well, tennis equipment has changed considerably in the last twenty years. If we go back to before 1976, really most players were playing with wooden rackets. And you notice the wood rackets' very small head sizes. Howard Head came along and not only innovated the ski industry with the first metal ski, but innovated the tennis industry with the first dimensional change in tennis rackets. And that, essentially, means he invented the oversized head. If you compare it to a wooden racket, you can see quite clearly you've got a much larger head on the oversize racket. That happened in the mid-seventies. Then the next major innovation occurred with another dimensional change in the rackets which was the wide body. Wide bodies allowed for greater stiffness in rackets therefore producing much more power.
And today the next biggest innovation is also dimensional—and that is length. Here is our new Mach 1000. The Prince Long Body racket gives you five major benefits. They are: more power, more control, more spin, more reach and more comfort. Welt, l think this is the last dimensional change in a racket that can occur. Again, just to repeat, you had the first dimensional change which was head size—larger head size; the second dimensional change was cross-section and now we're looking at the third and final eras that you can change in terms of a racket's geometry, which is length. So ! think what you'll see over the next several years is—who can make the best longer rackets.
？You will hear a presentation about an introduction of a racket goods sporting company.
？As you listen, for questions 1—12, complete the notes, using up to three words or a number.
？You will hear the recording twice.
INTRODUCTION OF PRINCE
NOTES
Range of Products
1. Prince is a major______company.
Location of the Company
2. The company has an office in______
Organization of the Company: 3 columns
3. one column, Rollerblade, is the______
4. another column, Nordica, which is the______
5. the third column is______
Three Major Dimensional Changes
6. the first change was______
7. the second change was______
8. the third change was______
Major Benefits of the Third Change
9. more______
10. more______
more spin
11. more______
12. more______
第2题
Inertial guidance systems are used today in airplanes, submarines, and spacecraft. They display for the pilot his pitch, roll and yaw angles, his heading, his speed, and his latitude and longitude. These are very important items to have readily available, whether one is in a high speed vehicle with very low visibility due to poor weather, or in a spacecraft traveling in lunar orbit. The main features of inertial systems are that they are automatic and do not require any external information. Thus, the pilot does not have to feed in any information except the original position and altitude. Inertial systems serve a need on fast moving vehicles moving in a three dimensional plane, where position information is required by the pilot almost constantly.
It can be interred from the article that an inertial guidance system is similar to
A．a gyroscope.
B．a high speed vehicle.
C．a navigator.
D．a submarine.
第3题
What does the professor imply when he says this？
A．At least 4 satellites can make 3D position.
B．To make 3D position three satellites are enough.
C．At least 4 satellites can make 2D position.
D．The GPS receiver is very difficult to lock.
第5题
Researchers at the Biorobotics (生物机械技术)Laboratory of McGill University in Montreal are building a robot , known as Micro Surgery robot-1(MSR- I for short), that will perform. delicate operations under the control of a human surgeon. The robot is specifically designed for performing eye surgery but could have other applications, such as the removal of brain tumors. The system could also be used to allow surgeons and their students to practise simulated surgery that feel like the real thing- without the real consequences for the patients.
During the operations, the surgeon manipulates a set of control known as the master. These are connected through a high- performance computer to the robot. Both the master and the robot have two limbs, When the surgeon moves the masters' limbs, the robots limbs move in exactly the same way, except that the movements can be scaled down as much as a thousand times. This will eliminate hand tremor and poor accuracy and thus reduce the damage to the eye that can occur with present microsurgery techniques. Each of the robots limbs has a minimum movement of one micrometer---more than one hundred times the precision of the human hand.
The computer also creates a three - dimensional robot' s eye view of the inside of the eye that the surgeon can see by wearing a virtual reality helmet (虚拟现实头盔) that has a small lens in front of each eye.
To provide the surgeon with such a realistic experience, MSR-I must be able to move rapidly, but this requires extremely fast computing. To handle the computational demands of instant interaction, the McGill team is constructing its own parallel-processing computer., It is al so studying areas such as muscle mechanism, artificial intelligence and optics, and has a already built another micro robot MR- I, capable of manipulating a single living cell.
Although commercial applications of the new system are not expected for several years, its basic mechanical components will be ready for testing in a few months, "The day when micro robots will be able to perform. surgery without human intervention is many years away," says Hunter, "in the meantime , a system such as MRS-I is a necessary precursor."
The so-called "virtual reality "mentioned in this passage is actually.
A．a surgical tool used for operations
B．a computer system used to produce life- like illusions
C．a new kind of applications in a visual technology.
D a way to carry out operations in a visual sense
第6题
第7题
About Gender Differences
It is said that the first thing we ask about a newborn baby is "Is it a boy or a girl？" But it might be considered that this is the first thing we ask ourselves whenever we meet anyone new. Perhaps this is why we find it so threatening if the cues are uncertain, and even more so if we find our first assumptions turns out to be incorrect.
Men are different from women. That would seem to be self-evident. They are different in ability, skill and behavior, but then, so is every individual person. So why do we make such a fuss about it？ It seems not unreasonable to suggest that the sexes are different because their brains are different, but then no two human brains are the same. It is suggested that our culture is in trouble because many women have been brought up to believe they should be as good as men. Well, why not？
Why will only touch on these topics briefly？ There is enough material for a dozen books. Suffice it to say that all the studies report on the way boys and girls are, not how they got to be that way, or rather how they were at the time of the study. Commonality across cultures and species implies some biological basis. The fact that the situation is changing reflects the power of socialization.
At School
There are studies about relative abilities of perception, vision, sound and touch. Certainly, if you watched a carpenter run his fingers along a planed surface and being able to tell how smooth it was, you would find it difficult to believe that boys lack tactile(触觉的) sensitivity.
Another is that girls tend to pick up auditory information while boys do better visually. Several studies suggested that, from school age on, boys outperformed girls in areas of mathematics involving abstract concepts of space, relationships and theory. The big issue is the difference in the spatial abilities between boys and girls. It seems that boys find it much easier to visualize and deal with spaces, the position of objects, relative heights and dimensions. In a test involving a three dimensional mechanical device, only a quarter of the girls could perform. the task as well as the boys and it isn't recorded if any boys were actually worse.
Why are girls more successful at school？ Perhaps emphasis on communication in projects and exams could explain the situation. Success at school nowadays depends on being able to write essays and examination papers. If girls are better at verbal communication than boys, then they are likely to succeed. But, if there are more boys than girls who find difficulty learning at school, does it not imply a serious defect in our educational system？
In Sports
In general, men are taller and heavier than women. In sports, men tend to outperform. women in strength and speed. Women seem to have greater endurance. In spite of many attempts, sports have never become completely intended for both men and women.
Yet, for example, running speeds for male and female athletes have improved steadily through the 20th century, but women have improved much more than men. The same is found for, athletics, swimming and cycling. Hence it is predicted that sex differences might disappear by the middle of the next century. However S.Seiler and S.Sailer, in "The Gender Gap. Elite Women Are Running Further Behind", point out that, since the date of their studies, the rate of improvement has much reduced. They suggest a correlation with the use of drugs enhancing performance, and their more recent prohibition. These have a greater effect on women than they do with men.
Biological Differences
Men, it is said, are generally more aggressive, physically and verbally, and enjoy taking risks. They play fighting games and enjoy "dares". More men than women are convicted for crimes, especially crimes of violence.
Some say that this is si
A．questioned by the author
B．certainly true
C．widely denied
D．not commented on
第8题
It sounded like a wicked idea. Even if the local supermarket was only two blocks away. Just think I could just switch on my PC and do my weekly shopping, then go back to bed and watch Richard and Judy while waiting for the delivery van to turn up. Trouble was, it didn't quite work out like that...
10:53 a.m.
Logged on to the site of A Certain Well Known Food Retailer Who Shall Remain Nameless. Immediately, I am presented with a bewildering selection of comestibles and consumables, all just a mouse-click away from my virtual shopping basket. Get in! This is cool
11:02 a.m.
Realise that I am actually missing the human contact. It's always fun watching someone making a life-or-death decision over what colour of bog roll to purchase. Or sniggering at the shell-suited fatties loading up their trolleys with 10kg bags of frozen chips, 48 packs of BSE-burgers and crates of cheap lager. Not to mention the obvious charms of that pert young checkout girl.
11:09 a.m.
Gina is really getting on my tits. She is the "virtual shop assistant" who seems to pop up on my screen every thirty seconds, flashing her 100-megawatt grin and offering totally useless advice.
11:13 a.m.
I can feel my enthusiasm rapidly away as I'm confronted with yet another daunting selection of foodstuffs. I honestly had no idea that there were so many different types of cheese to choose from.
11:21 a.m.
Is it really strictly necessary to show a full screen, three dimensional image of a tin of sodding baked beans？ It took ages to download. The realisation dawns on me that in the same space of time I could have gone out to the corner shop, bought the sodding beans, heated them up, toasted some bread, eaten it and done the washing up. It's a disturbing thought.
11:46 a.m.
I finally complete my shopping and log off, but not before leaving my suggestion in the site's guest book that Gina is terminated immediately with extreme prejudice. It's actually taken me longer that if I had done it in the real world. No matter the fact that it will soon be delivered directly to my doorstep will more than make up for that.
11:49 a.m.
Back in bed. I'm trying to rest, but every time I close my eyes, I see a grainy image of a wedge of Wensleydale. Feel slightly nauseous.
12:16 p.m.
No sign of the delivery van yet.
12:55 p.m.
Still hasn't turned up.
1:39 p.m.
Getting a bit fed with waiting.
2:01 p.m.
I can feel malnutrition gnawing at my insides, so I decide to grab a sandwich from the corner shop. Unfortunately, I'm stuck behind some doddery old gent who's picking up six back issues of Incontinence magazine, and insists on paying for them with 2p pieces from an old sweetie jar.
2:08 p.m.
The delivery van called while I was in Mr. Singh's. The driver has left a postcard saying he can either return at 4:30, or instead I can collect my shopping from their collection depot. My brain is numb with hunger. I decide on the second option.
2:35 p.m.
The depot turns out to be on the other side of town, so I have to get there by bus. I pick up my four carrier bags, and stagger back to the bus stop, the cheese-wire-like handles of the bags digging deep into my flesh.
4:27 p.m.
I eventually get home precisely three minutes before the deliveryman was due to call back. I have blisters the size of 50p pieces on my hands, I've coughed up ￡1.95 on bus fares, and I've spent a great total of two hours and thirty-nine minutes doing my shopping. And I still forgot to get the milk.
The author of the passage will, most probably in the future, ______.
A．continue to have fun shopping online
B．quit shopping online
C．shop online as well as go shopping in stores
D．ask for delivery service
第9题
This month is expected to see that seminal(有创意的)moment when digital cinema will outstrip the 35 mm technology that has been the dominant projection format in movie theatres for over 120 years. In 2009, digital accounted for only 15% of global screens. But the movie Avatar changed all that. 3D movies required digital, and Avatars phenomenal success with 3D pushed cinemas to adopt digital screens. IMS Screen Digest Cinema Intelligence Service estimates that by the end of 2012, digital will account for 63% of screens, and by 2015, 83 %. A majority of those screens will be based on Texas Instruments digital light processing(DLP)technology, a technology that uses millions of tiny mirrors on a tiny chip, each of them capable of moving thousands of times per second to create a digital image. That same technology today is also beginning to be used in cellphones and digital cameras to project images in those devices onto ordinary surfaces. That will be a bigger opportunity, says Kent Novak, Texas Instruments senior VP for DLP products, who was in Bangalore recently. Cinemas are moving rapidly to digital screens. Why？ The first digital movie was premiered(首演)in 1999. Initially it was thought moving to digital would give better picture quality and cost savings, but it took many years for a few systems to get deployed. And then Avatar happened. That was really the tipping point. In 2008, 15 3D movies were released; in 2009, it was close to 50. Theatres were able to get more people and get a higher price for the ticket, so it became a significant invenue generator. We have seen more conversion of film to digital in the last two years than in the previous ten. You are now bringing the technology to smaller devices. We are moving to put these chips into cellphones, digital still cameras, camcorders, laptop accessories, tablets, docking stations, media players. Weve been hearing of pico(handheld)projectors for some time now. But we dont really see products in the market. The technology has only recently reached a tipping point in terms of lighting efficiency and total brightness. Three years ago, 1 watt of power could get the brightness measurement of about 5 lumens. Today that 1 watt can give 20 lumens(making the projected image brighter). We designed the chip to be more efficient. Also, the industry driver for efficiency is LED. The amount of investment going into LED is enormous. As technology has improved, volumes have gone up, and cost has come down. Micromax and Spice in India have put projection even in some of their feature phones; Samsung has put projection on some of their phones. Nikon has DLP embedded in some of their digital still cameras, Sony has them in camcorders. What are the use cases that you see？ You can use your phone to show video clips, pictures, power point presentations, and make it a shared experience. India has been more progressive in adopting the technology because feature phones are a phone during the day and become the primary entertainment source in the evenings. India also has mobile TV phones with pre loaded Bollywood movies that can be projected out of the phone.
The word "outstrip" in the first paragraph most possibly mean "______. "
A．take off
B．outlive
C．surround
D．surpass
第10题
About Gender: Differences
It is said that the first thing we ask about a newborn baby is "Is it a boy or a girl？" But it might be considered that this is the first thing we ask ourselves whenever we meet anyone new. Perhaps this is why we find it so threatening if the cues are uncertain, and even more so if we find our first assumptions turns out to be incorrect.
Men are different from women. That would seem to be self-evident. They are different in ability, skill and behavior, but then, so is every individual person. So why do we make such a fuss about it？ It seems not unreasonable to suggest that the sexes are different because their brains are different, but then no two human brains are the same It is suggested that our culture is in trouble because many women have been brought up to believe they should be as good as men. Well, why not？
We will only touch on these topics briefly. There is enough material for a dozen books. Suffice it to say that all the studies report on the way boys and girls are, not how they got to be that way, or rather how they were at the time of the study. Commonality across cultures and species implies' some biological basis. The fact that the situation is changing reflects the power of socialization.
At School
There are studies about relative abilities of perception, vision, sound and touch. Certainly, if you watched a carpenter run his fingers al0hg a planed surface and being able to tell how smooth it was, you would find it difficult to believe that boys lack tactile (触觉的) sensitivity.
Another is that girls tend to pick up auditory information while boys do better visually. Several studies suggested that, from school age on, boys outperformed girls in areas of mathematics involving abstract concepts of space, relationships and theory. The big issue is the difference in the spatial abilities between boys and girls. It seems that boys find it much easier to visualize and deal with spaces, the position of objects, relative heights and dimensions. In a test involving a three dimensional mechanical device, only a quarter of the girls could perform. the task as well as the boys and it isn't recorded if any boys were actually worse.
Why are girls more successful at school？ Perhaps emphasis on communication in projects and exams could explain the situation. Success at school nowadays depends on being able to write essays and examination papers. If girls are better at verbal communication than boys, then they are likely to succeed. But, if there are more boys than girls who find difficulty learning at school, does it not imply a serious defect in our educational system？
In Sports
In general, men are taller and heavier than women. In sports, men tend to outperform. women in strength and speed. Women seem to have greater endurance. In spite of many attempts, sports have never become completely intended for both men and women.
Yet, for example, running speeds for male and female athletes have improved steadily through the 20th century, but women have improved much more than men. The same is found for, athletics, swimming and cycling. Hence it is predicted that sex differences might disappear by the middle of the next century. However S. Seller and S. Sailer, in "The Gender Gap.. Elite Women are Running Further Behind", point out that, since the date of their studies, the rate of improvement has much reduced. They suggest a correlation with the use of drugs enhancing performance, and their more recent prohibition. These have a greater effect on women than they do with men.
Biological Differences
Men, it is said, are generally more aggressive, physically and verbally, and enjoy taking risks. They play fighting games and enjoy "dares". More men than women are convicted for crimes, especially crimes of violence.
Some say that this is simply a matter of biology, others
A．questioned by the author
B．certainly true
C．widely denied
D．not commented on
第11题
The revamped service, scheduled to debut Wednesday, is the latest evolution for the pioneering retailer, the first to sell digital music files online in the late 1990s.
eMusic eschews copy protection technology as consumer-unfriendly, and caters to people whose tastes are largely ignored by mainstream music retailers.
"We're going after the minority of the market who doesn't want to wade through Britney Spears or OutKast," said David Pakman, eMusic's Chief operating officer.
The major online music retailers, such as Napster, MusicNet and market-leader iTunes Music Store, sell tunes by mostly major label acts.
The eMusic revamp has been in the works for the better part of a year, since the company was acquired from Vivendi by New York-based Dimensional Associates Inc. , the private equity arm of JDS Capital Management Inc.
When Dimensional took over, it began adding staff with experience running subscription-based businesses and immediately changed the pricing model so subscribers could no longer download an unlimited number of tracks.
"That was a negative gross margin business," Pakman said. "The company was losing money."
While eMusic's pricing model remains the same-subscriptions start at $ 9.99 per month for 40 downloads-what's changed is the means by which users can search and discover new music. So the service has added its panel of so-called music curators.
"What was missing from the eMusic service was a bunch of tools and features to really aid you in (the) discovery process," Pakman said. "What was missing was the curators."
Among the roster of music experts hired by eMusic are former Rolling Stone writer and author Michael Azerrad, former New York Times music critic Ann Powers and Justin Davidson, who won a Pulitzer Prize for his coverage of classical music.
The critics will write album reviews, columns, and communicate with subscribers on a message board.
Users will also be able to discuss or swap song recommendations with other subscribers through the message boards and other online community features.
By avoiding tracks from major labels, who only make their content available in file formats that come with licensing and copy protection safeguards, eMusic has also been able to sell its content in the MP3 file format.
MP3s can be played on most if not all digital music players on the market, and can be copied to other computers or burned to CDs without the limits imposed by record companies on other online retailers.
eMusie offers more than a half-million tracks. The service continued to operate in the months since the new management took over and currently has 70,000 subscribers, Pakman said.
eMusic was taken over by ______.
A．Vivendi Universal
B．Dimensional Associates Inc.
C．Rolling Stone
D．New York Times
