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Pistons may be made in （） in order to keep the weight down for balancing purposes at high speed.
A . cast iron
B . forged steel
C . stainless steel
D . aluminum alloy
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As the plunger moves up, the ports are closed and the fuel （） and delivered to the injector nozzle at very high pressure.
A . being compressed
B . to be pumped up
C . is pressurized
D . are built u
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In general, （） is suitable for delivering small quantities at high pressure.
A . reciprocating pump
B . gear pump
C . centrifugal pump
D . vane pum
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In a Java EE messaging application, one MDB is consuming a lot of memory at high traffic. What configuration should you use to prevent possible out-of-memory error at high traffic and at the same time not losing messages?（）
A . Configure a Work Manager for the MDB with a Maximum Thread Constraint.
B . Configure a Work Manager for the MDB with a Minimum Thread Constraint.
C . Configure a Work Manager for the MDB with a Maximum Thread Constraint and a Capacity Constraint.
D . Configure a Work Manager for the MDB with a Minimum Thread Constraint and a Capacity Constraint.
E . Configure a Work Manager for the MDB with both a Maximum Thread Constraint and Minimum Thread Constraint.
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An RPC/encoded Web service experiences poor performance at high message volumes. What can a developer do to improve this performance？（）
A . Turn off marshalling
B . Use binary encoding
C . Use RPC/literal encoding
D . Use document/literal encoding
E . Redesign to use more granular messaging
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Fuel has to be injected into the engine at a high pressure so that it （） correctly.
A . is purified
B . in timed
C . is compressed
D . atomize
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The tendency for lubricating oil to thin out at high temperatures and thicken at low temperatures will be characterized by a （）.
A . low viscosity index
B . high viscosity index
C . high neutralization number
D . low demulsibility quality
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A diesel engine is operating with excessively high exhaust temperatures at all cylindersTo correct this condition, you should FIRST （）.
A . reduce the engine load
B . increase the cooling water flow
C . increase the lube oil pressure
D . adjust the fuel rack
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In general, （） is suitable for delivering small quantifies at high pressure.
A . reciprocating pump
B . gear pump
C . centrifugal pump
D . vane pum
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He is a popular movie star. His popularity（）in the high attendance at all his movies.
A . reflects
B . reflected
C . is reflected
D . is reflecting
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（）with the size of the whole earth, the highest mountains do not seem high at all.
A . If you compare
B . Compare them
C . When compared
D . A compariso
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When the normal compression ratio of a diesel engine is not very high, misfiring at light loads may be caused by （）
A . overloading the engine
B . low exhaust valve lift
C . excessive cylinder cooling
D . insufficient mechanical clearance
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“I’m on a high today” means I have been to a high building today.
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A pulse is applied to each input of a 2-inpput NOR gate. One pulse goes High at t=0 and goes back LOW at t=1ms.The other pulse goes HIGH at t=0.8ms, and goes back LOW at t=3 ms . Please describe the output pulse.
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The idiom “ 白驹过隙 ” means to run at a high speed.
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134. Where would you find information about the time of high tide at a specific location on a particular day of the year?
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It is not advisable to make a high offer at the beginning of negotiation.
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听力原文：M: I'm really worried about paying my tuition for the next term at school. School fees are getting so high. I may have to cut back on my classes and work more hours to earn more.
W: I understand that you worry about that. Every year it seems to me that more students worry about money.
M: I agree. And it's hard to study full time and hold down any kind of job.
W: Have you thought about applying for financial aid？
M: Yah, now, I have, but the real problem is that so many people apply and there's just not enough financial aid available.
W: Maybe you could qualify for some kind of student loan that you would repay after you finish studying. You should go to the financial aid office and see what the requirements are.
M: I suppose that's true. Sometimes I wish the cost of education was completely covered by the government.
W: I'm sure we're not the only ones who are worried about this.
M: Oh, I think it's quite clear that a lot of people think about this. Now that a good education is becoming a must for one to get a good job, I think more people will worry in the future. I can't even pay for myself! How am I supposed to save up to pay for my kids to go to school？
W: Yeah, when you find the answer to that one, be sure to tell me.
(23)
A．The balance of work and study.
B．The financial aid.
C．Education and good job.
D．The tuition.
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When I was in high school, I had almost no individual identity left. I was a Hillcrest Husky and all other high schools were enemies. I was a wrestler and all the other sports were wimps. I was on the debate team and everyone else was dumb.
At my high school, everyone had a group; no one was an individual. Wait, I take that back. There were a few individuals, but they were completely outcast from our social order. Never in my life can I remember stronger feelings of hate in high school. But we never called it hate. We called it loyalty.
As adults, most of us are better at being an individual than we were in high school, but the influences of group identity continue to promote competition and prejudice in our world. If you are like me, you want to avoid teaching rivalry, conflict and prejudice to your children.
One possible strategy for stopping the negative influences of group identity would be: recognize and replay. Look for the prejudice in your life and replace it with charity. Treat every person as an individual and ignore the social classifications created by a group-dependent world.
A good friend and I once discussed our differing religions beliefs. He identified with a certain group and I with another. Because of our dependence on group identity, our conversations revolved around the beliefs of the groups. Our individual beliefs, which were quite similar, took a back seat while we discussed topics we knew little about. We defended our groups even when we did not understand or know the official group position on many issues. The resulting rivalry has damaged our friendship ever since.
My behavior. in this situation is exactly what scripture and wisdom teach us to avoid. How stupid I was to judge my friend by a group standard! How stupid I was to defend my own group even in areas I knew nothing about! I hope I can teach my children to behave differently.
Here, I have used religious beliefs to point only one area in which the influence of group identity can create problems. There are many others to consider also. Some of these are marriage, race, culture, language, geographic origin, education, and behavior. We should treat all people as individuals regardless of these conditions.
Finally, loyalty and group identity are not always bad. At times, they can help a lonely person to feel loved or a broken soul to feel success. Group identity can also help us to live a higher standard. But positive peer pressure should never replace individual, one-to-one acts of service and love.
According to the article, ______came along with group identity.
A．rivalry
B．prejudice
C．conflicts
D．all of the above
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You are at sea in an inflatable liferaft．In high latitudes，the greatest danger is ______．
A.asphyxiation due to keeping the canopy closed
B.hypothermia caused by cold temperature
C.collapse of the raft due to cold temperatures
D.starvation
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With a long history and high_________, this company has established a good reputation at home and abroad.
A、validity
B、capability
C、reliability
D、ability
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听力原文： I am honored to be here today, representing Harvard at this celebration of the College Board's half century of working to promote high standards and equal opportunity in higher education.
Before I say anything else, I want to thank everyone in the room for the work you do every day to make college affordable, available and successful for millions of young people across the country.
I want to focus my remarks on a matter of central concern to American families and to the future of the nation -- restoring education to its proper role as a pathway to equal opportunity and excellence in our society.
This has been an enduring theme in higher education, with great and creative efforts made by many institutions. Earlier this year, we announced a new initiative at Harvard aimed at the students from families of low and moderate income. Under our new program, families with incomes of less than $ 40,000 will no longer be expected to contribute to the cost of attending Harvard for their children. Families with incomes of less than $ 60,000 will also see their contributions reduced.
We are proud of this effort at Harvard, but we are aware that the programs of individual institutions with means can never be a substitute for our shared public responsibility to provide adequate funding for Pell grants and other financial aid, and for the state and community college systems that make higher education accessible and affordable for the broad public.
There is something empty about undertaking initiatives that may be right for one institution without attention to their broader impact. Likewise, we fall short if we urge changes in national policy without doing what we can on our own campuses.
In this spirit, I want to address today a problem that is emerging with increasing urgency in this nation.
I am honored to be here today, (1) Harvard at this celebration of the College Board's half century of working to promote (2) and equal opportunity in higher education.
Before I say anything else, I want to thank everyone in the room for the work you do every day to make college (3) , available, and (4) for millions of young people across the country.
I want to focus my remarks on a matter of (5) to American familiesand to the future of the nation -- restoring education to its proper role as a (6) to equal opportunity and (7) in our society.
This has been an (8) in higher education, with great and creative efforts made by many institutions. Earlier this year, we announced a new (9) at Harvard aimed at the students from families of low and (10) income. Under our new program, families with incomes of (11) will no longer be expected to contribute to the cost of attending Harvard for their children. Families with incomes of less than $ 60,000 will also see their (12) reduced.
We are proud of this effort at Harvard, but we are aware that the programs of individual institutions with means can never be a substitute for our shared (13) to provide adequate funding for Pell grants and other financial aid, and for the state and community college systems that make higher education (14) and affordable for the (15) .
There is something empty about (16) initiatives that may be right for one institution without attention to their broader impact. (17) , we (18) if we urge changes in national policy without doing what we can on our own campuses.
In this spirit, I want to (19) today a problem that is emerging with (20) in this nation.
(36)
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Radar （雷达)1. Children enjoy shouting at a high w...
Radar (雷达)
1. Children enjoy shouting at a high wall and hearing the sound come back to them. These sounds are called echoes (回声). Echoes have given us a number of 'valuable tools.
2. Echo sounding devices were early used in making maps of the ocean floor. Sounds or Ultrasonic (超声的) sounds make good tools for determining how deep the water is under ships. Sometimes echoes from ultrasonic distance finding devices were prevented from working by fish swimming past or by the presence of large objects. So ultrasonic devices have been replaced by other tools.
3. Radar is now a familiar tool. Like many others it was ah unexpected discovery. It was first observed by two researchers, who were studying sound communication. They were sending signals from a station on one side of a river in Washington, D .C. to a vehicle across the river. They discovered that their signals were stopped by passing ships. They recognized the importance of this discovery at once.
4. All this was of course just a start, from which our present radar has developed. The word "radar," in fact, gets its name from the term "radio detection (检测) and ranging." "Ranging" is the term for detection of the distance between an object and the radar set. Today, in our scientific age, it would be difficult to manage without radar.
5. One of the many uses of radar is as a speed control device on highways. When a person in an automobile is driving faster than the speed limit, radar will show this clearly and the traffic police can take measures to stop him.
6. A pilot cannot fly a plane by sight alone. Many conditions such as flying at night and landing in dense fog require the pilot to use radar. Human eyes are not very good at determining speeds of approaching objects, but radar can show the pi lot how fast nearby planes are moving.
A Study of Sound
B Highway Police
C Working Principles
D Early Use of "Radar"
E Useful Tools
F Discovery by Chance
Paragraph 2 ______
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A pulse is applied to each input of a 2-input NOR gate. One pulse goes HIGH at t=0 and goes back LOW at t=1ms. The other pulse goes HIGH at t=0.8ms and goes back LOW at t=3ms. The output pulse can be
A．It goes LOW at t=0 and back HIGH at t=3ms.该脉冲在t=0ms降为低电平，t=3ms时返回高电平
B．It goes LOW at t=0.8ms and back HIGH at t=3ms.该脉冲在t=0.8ms降为低电平，t=3ms时返回高电平
C．It goes LOW at t=0.8ms and back HIGH at t=1ms.该脉冲在t=0.8ms降为低电平，t=1ms时返回高电平
D．It goes HIGH at t=0.8ms and back LOW at t=1ms.该脉冲在t=0.8ms升为高电平，t=1ms时返回低电平
