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explain the following terminologies: （4 points per question, 40 points in total) （1) plast

1. explain the following terminologies: (4 points per question, 40 points in total) (1) plastic forming (2) principal stresses (3) yielding (4) Tresca’s yield criterion (5) superplasticity (6) recrystallization temperature (7) true strain (8) The generalized Hooke’s law (9) Incremental theories (10) Strain energy per unit volume

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第1题

The following questions pertain to the image chara...

The following questions pertain to the image characteristics of all types of mirrors discussed in this unit - plane mirrors, concave mirrors, and convex mirrors. Use your understanding of the object-image relationships for these three types of mirrors to answer the questions. The diagram below shows a spherical surface that is silvered on both sides. Thus, the surface serves as double-sided mirror, with one of the sides being the concave and one being the convex side. The principal axis, focal point, and center of curvature are shown. The region on both sides of the mirror is divided into eight sections (labeled M, N, P, Q, R, S, T, and W). Five objects (labeled 1, 2, 3, 4, and 5) are shown at various locations about the double-sided mirror. Use the diagram to answer the questions #1-6.1. The image of object 1 would be located in section ______. M、 N、 P、 Q、 R、 S、 T、 W 2. The image of object 2 would be located in section ______. M、 N、 P、 Q、 R、 S、 T、 W 3. The image of object 3 would be located in section ______. M、 N、 P、 Q、 R、 S、 T、 W 4. The image of object 4 would be located in section ______. M、 N、 P、 Q、 R、 S、 T、 W 5. The image of object 5 would be located in section ______. M、 N、 P、 Q、 R、 S、 T、 W 6. The double-sided mirror would cause virtual image to be formed of objects ________. M、 N、 P、 Q、 R、 S、 T、 W 7. How can a plane mirror, concave mirror, and/or convex mirror be used to produce an image that has the same size as the object? 8. How can a plane mirror, concave mirror, and/or convex mirror be used to produce an upright image? 9. How can a plane mirror, concave mirror, and/or convex mirror be used to produce a real image? 10. The image of an object is found to be upright and reduced in size. What type of mirror is used to produce such an image?

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第2题

NotethefollowingpointsdescribingvariousutilitiesinOracleDatabase1g：1.Itenablesthehigh-speedtransferofdatafromonedatabasetoanother.2.Itprovidesacompletesolutionforthebackup，restoration，andrecoveryneedsoftheentiredatabase.3.ItenablestheloadingofdatafromanexternalfileintoanOracledatabase.4.ItprovidesatapebackupmanagementfortheOracleecosystem.WhichpointdescribesOracleSecureBackup（）

A.1

B.2

C.3

D.4

E.1，2，and4

F.1，2，3，and4

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第3题

II. Concepts: B1-7 (5 points each, 35 points in to...

II. Concepts: B1-7 (5 points each, 35 points in total) B1. What is the main task of the internet layer in the TCP/IP reference model respectively? What kind of protocol performs that task? B2. Please explain the differences between switches and routers. Hint you: Which layer do they work at? What kind of address do they forward data based on? B3. Why we need media access control? Please list two or more media access control methods. B4. What is the exposed station problem? Please sketch a graph to explain if necessary. B5. Besides flooding, what other routing algorithms have you learned? B6. Transport layer uses both flow control and congestion control. Please tell us what flow control is and what congestion control is? B7. What is the main difference between TCP and UDP?

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第4题

NotethefollowingpointsdescribingvariousutilitiesinOracleDatabase11g：1：Itenablesthehigh-speedtransferofdatafromonedatabasetoanother.2：Itprovidesacompletesolutionforthebackup，restoration，andrecoveryneedsoftheentiredatabase.3：ItenablestheloadingofdatafromanexternalfileintoanOracledatabase.4：ItprovidesatapebackupmanagementfortheOracleecosystem.WhichpointdescribesOracleSecureBackup（）

A.1

B.2

C.3

D.4

E.1，2，and4

F.1，2，3，and4

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第5题

III. Computation: C1-5. ( 55 points in total ). Th...

III. Computation: C1-5. ( 55 points in total ). The process/procedure or explanation of computation and the correct results are all wanted. C1. (10 points) Consider building a CSMA/CD network running at 100Mbps over a 2-km cable with no repeaters. The signal speed in the cable is 20,000 km/sec. What is the minimum frame size? C2. (13 points) A bit stream 0110110 is transmitted using CRC method. The generator polynomial is x3+ x2+1. a) How many check bits should be added? b) Show the actual bit string transmitted by the sender end. c) Suppose that the second bit from the left is inverted during transmission. Show that this error will be detected by the receiver. C3. (10 points) A channel has a bit rate of 64 kbps and a propagation delay of 2 msec. For what range of frame sizes does stop-and-wait give an efficiency of at least 80 percent? C4. (12 points) A router has the following entries in its routing table: Address/Mask Next hop 130.96.39.0/24 Interface 1 130.96.39.128/25 Interface 0 130.96.40.0/25 Router 1 192.4.10.0/23 Router 2 Default Router 3 For each of the following IP addresses, what does the router do if a packet with that address arrives? Please state why you choose it. 1) 192.4.11.172 2) 130.96.39.135 3) 130.96.39.96 4) 130.96.40.168 5) 130.96.40.64 C5. (10 points) In a subnet, distance vector routing is used, and the following vectors have just come in to router D: from B: (5, 0, 8, 12, 6, 2); from C: (16, 12, 0, 6, 9, 10); and from E: (7, 6, 3, 9, 0, 4). The measured delays to B, C, and E, are 6, 8, and 5, respectively. What is D's new routing table? Give both the outgoing line to use and the expected delay.

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第6题

NotethefollowingpointsdescribingvariousutilitiesinOracleDatabase11g：1.Itenablesthetransferofdatafromonedatabasetoanother.2.Itprovidesacompletesolutionforthebackup，restoration，andrecoveryneedsoftheentiredatabase.3.ItenablestheloadingofdatafromanexternalfileintotablesofanOracledatabase.4.ItprovidesatapebackupmanagementfortheOracleecosystem.WhichpointdescribestheOracleDataPumputility（）

A.1

B.2

C.3

D.4

E.1and3

F.1，2，3，and4

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第7题

Part A

Directions: Read the following four texts. Answer the questions below each text by choosing A, B, C or D. (40 points)

The unknown pervades the universe. That which people can see, with the aid of various sorts of telescope, accounts for just 4% of the total mass. The rest, however, must exist. Without it, galaxies would not survive and the universe would not be gently expanding, as witnessed by astronomers. What exactly constitutes this dark matter and dark energy remains mysterious, but physicists have recently uncovered some more clues, about the former, at least.

One possible explanation for dark matter is a group of subatomic particles called neutrinos. Neutrinos are thought to be the most abundant particles in the universe. According to the Standard Model, the most successful description of particle physics to date, neutrinos come in three varieties, called "flavors". Again, according to the Standard Model, they are point-like, electrically neutral and massless. But in recent years, this view has been challenged, as physicists realized that neutrinos might have mass.

The first strong evidence came in 1998, when researchers at an experiment, based in Japan, showed that muon neutrinos produced by cosmic rays hitting the upper atmosphere had gone missing by the time they should have reached an underground detector. Its operators suspect that the missing muon neutrinos had changed flavor, becoming electron neutrinos or-more likely-tau neutrinos. Theo- ry suggests that this process, called oscillation, can happen only if neutrinos have mass.

Over the coming months and years, researchers hope to produce the most accurate measurements yet. The researchers created a beam of muon neutrinos first. On the other side of the target sat a particle detector that monitored the number of muon neutrinos leaving. The neutrinos then travelled 750km (450 miles) through the Earth to a detector in a former iron mine in Soudan, Minnesota. Researchers then were able to confirm that a significant number of muon neutrinos had disappeared-that is, they had changed flavor. While their mass is so small that neutrinos cannot be the sole constituent of dark matter, they have an advantage in that they are at least known to exist.

The same cannot be said for sure of another possible form. of dark matter being studied by a group of physicists in Italy. If the result continues to withstand scrutiny, it would appear to be evidence for an exotic new sort of fundamental particle, known as an axion, which could also be a type of dark matter.

What does the word "pervades"(Line 1, Para. 1) mean?

A．Be of higher rank or authority.

B．To spread through the whole extent of.

C．To gain the victory or superiority.

D．To make something come true.

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第8题

Task 1

Directions: After reading the following passage, you will find 5 questions or unfinished statements, numbered 36 through 40. For each question or statement there are 4 choices marked A, B, C, and D. You should make the correct choice.

For most Americans, the word "poverty" suggests destitution: an inability to provide a family with nutritious food, clothing, and reasonable shelter. But only a small number of the 35 million persons classified as "pour" by the Census Bureau fit that description.

While the poor are generally well-nourished, some poor families do experience hunger, meaning a temporary discomfort due to food shortages. According to the U.S. Department of Agriculture (USDA), 13 percent of poor families and 2.6 percent of poor children experience hunger at some point during the year. In most cases, their hunger is short-term. Eighty-nine percent of the poor report their families have "enough" food to eat, while only 2 percent say they "often" do not have enough to eat.

The typical American defined as poor by the government has a car, air conditioning, a refrigerator, a stove, a clothes washer and dryer, and a microwave. He has two color televisions, cable or satellite TV reception, a VCR or DVD player, and a stereo. He is able to obtain medical care. His home is in good repair and is not overcrowded. By his own report, his family is not hungry and he had sufficient funds in the past year to meet his family's essential needs. While this individual's life is not well-off, it is equally far from the popular images of frightening poverty conveyed by the press.

For most Americans, a "poor" man is the person who ______.

B．call not afford a lot of food

C．has no rich material wealth

D．has no work

E．has no money

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第9题

Task 1

Very old people do raise moral problems for almost everyone who comes into contact with them. Their values—this can't be repeated too often—are not necessarily our values. Physical comfort, cleanness and order are not necessarily the most important things for the very old people. The social services from time to time find themselves faced with a flat with decaying food covered by small worms, and an old person lying alone on bed, taking no notice of the worms. Is it interfering with personal freedom to insist that they go to live with .some of their relatives so that they might be taken better care of? Some social workers, the ones who clear up the worms, think we are in danger of carrying this concept of personal freedom to the point where serious risks are being taken with the health and safety of the old.

Indeed, the old can be easily hurt or harmed. The body is like a car: it needs more mechanical maintenance as it gets older. You can carry this comparison right through to the provision of spare parts. Never forget that such operations are painful experience, however good the results. At what point should you cease to treat the old body? Is it morally right to try to push off death by pursuing the development of drugs to excite the forgetful old mind and to activate (使......活动) the old body, knowing that it is designed to die? You cannot ask doctors or scientists to decide, because so long as they can see the technical opportunities, they will feel bound to give them a try on the principle that while there's life, there's hope.

When you talk to old people, however, you are forced to the conclusion that whether age is happy or unpleasant depends less on money or on health than it does on your ability to have fun.

It is implied in Para. I that .

A．very old people enjoy living with their relatives

B．social services have nothing to do with the very old people

C．some old people like to live alone to have more personal freedom

D．no one is willing to take care of very old people

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第10题

Task 1

The statement that "Love is blind" is all too true. People in love need to depend on others to help them separate their idealization of who they think their lover is from the reality of who their counterpart(对方) really is. That is one reason why I don't advise Internet dating since it is very difficult to get realistic impressions of supposed Internet counterparts.

Sadly, students have told me that as soon as people finally reach the point of marriage, "true love dies". I disagree. It is not the end of true love, but the beginning of realistic love. I have been married for 21 years in a cross-cultural marriage. Despite the difficulties of such marriage, I love my wife now more than ever before. But that does not mean my emotions are always the same as when I first fell in love. As a matter of fact, love is more than emotion; it's both a decision and a commitment(承诺，奉献).

True love must include making a self sacrificial(自我牺牲的) commitment to always work for another person's good. I like to think that falling in love is like a match lighting a candle. It can start a love relationship. But it doesn't "hold a candle" to the true lifelong realistic commitment that makes true love last for life. Unlike a candle, true love will not grow tired and eventually bum out, but will grow ever deeper throughout a lifetime.

People in love usually can't ______ their idealization of their lover from the reality.

A．separate

B．connect

C．depend on

D．think

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