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（请给出正确答案）
[多选题]
Engineering materials may be further subdivided into（)
A.Metal
B.Ceramics
C.Composite
D.Polymers
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（请给出正确答案）
A.Metal
B.Ceramics
C.Composite
D.Polymers
答案
更多“Engineering materials may be further subdivided into()”相关的问题
第1题
A．Right
B．Wrong
C．Not mentioned
第2题
A．Right
B．Wrong
C．Not mentioned
第3题
Engineering Ethics
Engineering ethics is attracting increasing interest in engineering universities throughout the nation. At Texas A&M University, evidence of this interest in professional ethics culminated in the creation of a new course in engineering ethics, as well as a project funded by the National Science Foundation to develop material for introducing ethical issues into required undergraduate engineering courses. A small group of faculty and administrators actively supported the growing effort at Texas A&M, yet this group must now expand to meet the needs of increasing numbers of students wishing to learn more about the value implications of their actions as professional engineers.
The increasing concern for the value dimension of engineering is, at 1east in part, a result of the attention that the media has given to cases such as the Challenger disaster, the Kansas City Hyatt-Regency Hotel walkways collapse, and the Exxon oil spill. As a response to this concern, a new discipline, engineering ethics, is emerging. This discipline will doubtless take its place alongside such well-established fields as medical ethics, business ethics, and legal ethics.
The problem presented by this development is that most engineering professors are not prepared to introduce literature in engineering ethics into their classrooms. They are most comfortable with quantitative concepts and often do not believe they are qualified to lead class discussions on ethics. Many engineering faculty members do not think that they have the time in an already overcrowded syllabus to introduce discussions on professional ethics, or the time in their own schedules to prepare the necessary material. Hopefully, the resources presented herein will be of assistance.
Engineering ethics is a compulsory subject in every institute of science and technology in the United States.
A．Right
B．Wrong
C．Not mentioned
第4题
Admissions Notice
John Washington,
We have (150) your completed application form. and all necessary documents and materials and other sources.
A preliminary check of the material indicates that you are academically (151) for admission. We now formally inform. you that you will be admitted (152) the Graduate School of Engineering of the Massachusetts Institute of Technology for the fall term 2009 to work towards the degree of M. S.
We heartily welcome you to join us on our campus.
Yours Truly
Andrew Boswell
Admissions Officer
(50)
A．receives
B．receiving
C．receive
D．received
第5题
The creative shaping process of a technologist's mind can be seen in nearly every artifact that exists. For example, in designing a diesel engine, a technologist might impress individual ways of nonverbal thinking on the machine by continually using an intuitive sense of rightness and fitness. What would be the shape of the combustion chamber？ Where the valves should be placed？ Should it have a long or short piston？ Such questions have a range of answers that are supplied by experience, by physical requirements, by limitations of available space, and not least by a sense of form. Some decisions, such as wall thickness and pin diameter, may depend on scientific calculations, but the nonscientific component of design remains primary.
Design courses, then should be an essential element in engineering curricula. Nonverbal thinking, a central mechanism in engineering design, involves perceptions, the stock-in-trade of the artist, not the scientist. Because perceptive processes are not assumed to entail "hard thinking", non- verbal thought is sometimes seen as a primitive stage in the development of cognitive processes and inferior to verbal or mathematical thought. But it is paradoxical that when the staff of the Historic American Engineering Record wished to have drawings made of machines and isometric views of industrial processes for its historical record of American engineering, the only college students with the requisite abilities were not engineering students, but rather students attending architectural schools.
If courses in design, which in a strongly analytical engineering curriculum provide the back- ground required for practical problem-solving, are not provided, we can expect to encounter silly but costly errors occurring in advanced engineering systems. For example, early models of high-speed railroad cars loaded with sophisticated controls were unable to operate in a snowstorm because a fan sucked snow into the electrical system. Absurd random failures that plague automatic control systems are not merely trivial aberrations; they are a reflection of the chaos that results when design is assumed to be primarily a problem in mathematics.
The author write this passage mainly to______.
A．introduce a new idea.
B．stress the importance of nonverbal thinking.
C．criticize the education for omitting an important part of knowledge.
D．propose a suggestion.
第6题
Vitamin A is necessary for the body's natural defense system against disease. Vitamin A is needed to help prevent skin and other tissues from drying out. It also produces a light-sensitive substance in the eyes.
People who do not get enough Vitamin A cannot see well in the dark. They may develop a condition that dries the eyes. The condition can result in infections that lead to blindness.
A lack of Vitamin A is a major cause of blindness among children. Health experts estimate that 124 million children around the world do not eat enough foods with Vitamin A.
Vitamin A is found in fish liver oil and in the yellow part of eggs. Vegetables such as carrots and sweet potatoes contain beta carotene, a substance that the body changes into Vitamin A.
Public health campaigns to provide Vitamin A to those who need it have proved costly. And they are not always effective. That has led researchers to try to create foods with the vitamin.
Rice is one of the most common crops grown worldwide. However, normal rice lacks Vitamin A. Researchers at a laboratory in Switzerland found a way to change the genetic material of rice. They added three genes to the rice. The genes produce beta carotene, the chemical that our bodies change into Vitamin A.
The new rice has a golden yellow color. The researchers say 200 grams of the rice have enough beta carotene to provide the necessary amount of Vitamin A.
Biologist Mary Lou Guerinot of Dartmouth College wrote a commentary published with the report in science magazine. She said the rice is an excellent example of the good things that can be done with genetic engineering. However, critics of genetic engineering argue that changing plant genes could increase risks to human health or the environment.
With Vitamin A people won't get any diseases.
A．Right
B．Wrong
C．Not mentioned
第7题
听力原文：M: Hi Diana, mind if I sit down？
W: Not at all, Jerry. How have you been？
M: Good. But I'm surprised to see you on the city bus. Is your car in the shop？
W: No. I've just been thinking a lot about the environment lately. I think the air will be a lot cleaner if we all use public transportation when we could.
M: You are right. The diesel bus isn't exactly pollution free.
W: True. But they'll be running a lot cleaner soon. We were just talking about that in my environmental engineering class.
M: What's the city going to do？ Install pollution filters in the buses？
W: They could, but those filters make the engines work harder and really cut down on fuel efficiency. Instead they found a way to make their engines more efficient.
M: How？
W: Well, there is a material called the coniine oxide. It's a really good insulator. And a thick coat of it gets sprayed on the certain part of the engine.
M: An insulator？
W: Yeah. Actually, what it does is to reflect back the heat of burning fuel. So the fuel will bum more completely.
M: Sounds like people should all go out and get this stuff to spray their car engines.
W: Well, it's not really that easy. You first have to heat the material over 10,000 degrees and then, well, you get the idea. It's not something you or I can do ourselves.
(27)
A．How to produce pollution free bus.
B．How to prevent our environment from being polluted.
C．Whether to ride a passenger bus or a private car.
D．How to reduce the pollutants produced by bus.
第8题
听力原文：W: Hi, Mike.
M: Hi. I'm surprised to see you on the city bus. Why not drive your car？
W: (23) I've been thinking about the environment lately. If we all use public transportation when we could, the air will be much cleaner.
M: Right. But the bus isn't exactly pollution free.
W: True. But they'll be running a lot cleaner soon. We were just talking about that in my environmental engineering class.
M: What's the city going to do？ Install pollution filters of some sort on their buses？
W: They could, but those filters make the engines work harder and really cut down on fuel efficiency. Instead they found a way to make their engines more efficient.
M: How？
W: (24) Well, there is a material called the confine oxide. It's a really good insulator. And a thick coat of it gets sprayed on the certain part of the engine.
M: An insulator？
W: (25) Yes. It reflects back the heat of burning fuel. So the fuel will burn much more hotly and burn up more completely.
M: So a lot less unburned fuel comes out to pollute the air, right？
W: (25) Yeah, and the bus will need less fuel. So with the savings on fuel cost, they say this will all pay for itself in just six months.
M: Sounds like people should all go out and get this stuff to spray their car engines.
W: Well, not really that easy. To melt the materials before you can spray a coat of it on the engine parts, you first have to heat it over 10,000 degrees. It's not something we are able to do ourselves.
23. Why doesn't the woman drive her car？
24.What are the two speakers talking about？
25.What can we learn from the conversation about the material mentioned？
(20)
A．Something is wrong with her car.
B．The cost of the fuel is high.
C．It's cheap to take bus.
D．She thinks public transportation is environmental friendly.
第9题
Solar Power without Solar Cells
A dramatic and surprising magneticeffect of light discovered by University of Michigan1researcherscould lead to solar power without traditional semiconductor-based solar cells.The researchers found a way to make an“optical51 ,” said Stephen Rand, a professor in thedepartments of Electrical Engineering and Computer Science, Physics and AppliedPhysics.
Light has electric and magnetic52 .Until now, scientists thought the effect of the magnetic field were so weakthat they could be 53 . What Rand and his colleagues found isthat at the right intensity, when light is traveling through a material thatdoes not 54 electricity, the light field cangenerate magnetic effects that
are 100 million times stronger than previouslyexpected. Under these circumstances, the magnetic effects develop strength55 toa strong electric effect.
“This could lead to a new kind of solarcell without semiconductors and without absorption to produce charge separation,” Rand said. “In solar cells, the 56 goesinto a material, gets absorbed and creates heat. Here, we expect to have a verylow heat load2. Instead of the light being absorbed, energy is stored in themagnetic moment3. Intense magnetization can be induced by intense light andthen it is ultimately capable of providing a capacitive power 57 Whatmakes this possible is a previously undetected brand of “opticalrectification,” says William Fisher, a doctoral student in applied physics. Intraditional optical rectification, light's electric field causes a chargeseparation, or a pulling58of the positive and negative charges ina material. This sets up a voltage, similar to59in a battery.
Rand and Fisher found that under the rightcircumstances and in right types of materials, the light's magnetic field canalso create optical rectification. The light must be shone througha 60 thatdoes not conduct electricity, such as glass. And it must be focused to anintensity of 10 million watts per square centimeter8. Sunlight isn't this61 onits own, but new materials are being sought that would work at lowerintensities, Fisher said.
“In our most recent paper, we show thatincoherent light9 like sunlight is theoretically almost62effectivein producing charge separation as laser light is,” Fisher said.
This new63 couldmake solar power cheaper, the researchers say. They predict that with improvedmaterials they could achieve 10 percent efficiency in converting solar power touseable energy. That's equivalent to today's commercial-grade solar cells.
“To manufacture modem solar cells, youhave to do64 semiconductor processing,” Fisher said.“All we would need are lenses to focus the light and a fiber to guide it. Glassworks for65 .It's already made in bulk, and itdoesn't require as much processing. Transparent ceramics might be even better.”
51.A.disc
B.fiber
C.instrument
D.battery
第10题
听力原文：M: Hi Diana, mind if I sit down？
W: Not at all, Jack. How have you been？
M: Good. But I'm surprised to see you on the city bus. Your car in the shop？
W: No. I've just been thinking a lot about the environment lately. So I decided the air will be a lot cleaner if we all use public transportation when we could.
M: I'm sure you are right. The diesel bus isn't exactly pollution free.
W: True. But they'll be running a lot cleaner soon. We were just talking about that in my environmental engineering class.
M: What's the city gonna do？ Install pollution filters of some sort on their buses？
W: They could, but those filters make the engines work harder and really cut down on fuel efficiency. In stead they found a way to make their engines more efficient.
M: How？
W: Well, there is a material called coniine oxide. It's a really good insulator. And a thick coat of it get sprayed on certain part of the engine.
M: An insulator？
W: Well, yeah. Actually, what it does is reflect back the heat of burning fuel. So the fuel will burn much hotter and burn up more completely.
M: So a lot less unburned fuel comes out to pollute the air, right？
W: Yeah, and the bus will need less fuel. So with the savings on fuel oil costs, they say this will all pay for itself in just six months.
M: Sounds like people should all go out and get some of this stuff to spray on their car engines.
W: Well, it's not really that easy. You see, normally, the materials are fine powder. To melt it so you can spray a coat of it on the engine parts, you first have to heat it over 10,000 degrees and then, well, you get the idea. It's not something you or I would be a ble to do ourselves.
(23)
A．A new fuel for buses.
B．The causes of air pollution.
C．Careers in environmental engineering.
D．A way to improve fuel efficiency in buses.
