钢管在水压过程中产生弯曲的原因是什么?如何防止?

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问题:

钢管在水压过程中产生弯曲的原因是什么?如何防止?

考点:轧钢工考试高级螺旋钢管制造工高级螺旋钢管制造工题库
题型:问答题 简答题

煤气管道的可靠切断是()。

A.盲板

B.阀门

C.煤气总阀

D.空气总阀

题型:问答题 简答题
There was once a farmer who had a fine olive orchard(橄榄园). He was very hardworking, and the  36  always prospered(繁荣)under his care. But he knew that his three  37  looked down upon the farm work, and were eager to make wealth.
When the farmer was  38  and felt that he would die, he  39  the three sons to him and said, “My sons, there is a pot of gold  40  in the olive orchard. Dig for it, if you wish it.”
The sons tried to  41  him to tell them in what part of the orchard the  42  was hidden, but he would tell them nothing more.
After the farmer was  43 , the sons went to work to find the pot of gold; since they did not  44  where the hiding-place was, they agreed to begin in a line, at one  45  of the orchard, and to dig until one of them should find the money.
They  46  until they had turned up the  47  from one end of the orchard to the other,  48  the tree-roots and between them.  49  no pot of gold was to be found. It seemed as if someone must have stolen it, or as if the farmer had been wandering in his wits. The three sons were bitterly  50  to have all their work for nothing.
The next olive  51 , the olive trees in the orchard bore(结果实)more fruit than they had  52  given; when it was  53 , it gave the sons a whole pot of gold.
And when they saw how much money had  54  the orchard, they suddenly understood what the wise father had  55  when he said, “There is gold hidden in the orchard. Dig for it, if you wish it.”
小题1:
A.farmB.gardenC.factoryD.hospital
小题2:
A.friendsB.sons C.relativesD.children
小题3:
A.healthyB.oldC.unluckyD.sad
小题4:
A.showedB.ledC.calledD.visited
小题5:
A.sentB.putC.hiddenD.locked
小题6:
A.waitB.causeC.makeD.get
小题7:
A.goodsB.jewelC.clothesD.gold
小题8:
A.weakB.lost C.dead D.sick
小题9:
A.thinkB.know C.wonderD.realise
小题10:
A.endB.topC.surface D.bottom
小题11:
A.dugB.searched C.discoveredD.expected
小题12:
A.sandB.soil C.ground D.floor
小题13:
A.overB.amongC.roundD.across
小题14:
A.SinceB.AndC.Before D.But
小题15:
A.disappointedB.surprisedC.worriedD.sad
小题16:
A.season B.partC.distance D.degree
小题17:
A.alreadyB.even C.ever D.still
小题18:
A.made B.sold C.shippedD.saved
小题19:
A.come onB.come aboutC.come upD.come from
小题20:
A.thoughtB.plannedC.guessed D.meant
题型:问答题 简答题

一个关系表的行称为 __________ 。

题型:问答题 简答题

何谓病毒的干扰?干扰的意义如何?

题型:问答题 简答题

阅读理解

      Online games, social-networking web sites, and chat rooms are fascinating and motivating for teens

and help with their development. When adults look at teens today, they think what they are doing is

different and seem to be wasting a lot of time. And those activities seem quite foreign. But when we look

closely at what kids are doing, it's not much more different than what their parents did. They are hanging

out with their friends, finding romantic partners, and trying to identify themselves.

     Today's teens are being raised with technologies that allow them to have self-directed learning on

their own terms, on their own time, and without the limitations of a classroom setting. This gives the teens

a feeling of freedom. This is very different from how kids learn in school when they are handed a set

body of knowledge required to master by their teachers.

     Teens were motivated to be addicted to online because they were either driven by interest or

friendship. And there are some specific findings according to a research:

      One major finding is that there is a generation gap in how parents and teens view the teen's online

activities. Adults think the activities draw their attention from school work and are left in the dark about

what their teens are doing online. Teens, on the other hand, understand the value of the Internet and are

motivated to take part.

     Another finding shows that teens are not taking full advantage of the Internet. They are using the social

networks to chat and post photos and make friends, which are important to their development, but they

are not making use of other existing opportunities to learn about astronomy, foreign languages, and other

subjects only a few clicks away.

     Teens are also improving their social skills online by learning the basic social and technical skills

needed to interact (互相作用) in today's digital world.

     Pressure from those of the same age also takes on a new role online. Teens are reporting that they

are more motivated by those of their age online with public spaces that allow the teens to interact and

provide feedback to one another.

     While teens are using the Internet for both social and intellectual development, they are also facing

significant challenges on how to manage their relationships online.

1. The writer is probably ________.

A. a parent

B. a teenager

C. a teacher

D. a researcher

2. Which of the following best describes how the writer thinks about teens and online activities?

A. Supportive.

B. Objective.

C. Understandable.

D. Negative.

3. Which of the following is NOT mentioned in the passage?

A. Internet is a source of learning for teens.

B. Outside classroom learning is equally valuable.

C. Teens need to learn more effectively online.

D. Parents should also learn to use Internet.

4. How many specific(确切的) findings are listed in this passage?

A. Two.

B. Three.

C. Four.

D. Five.

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