控制元件在液压系统中控制和调节液体的() A.压力 B.流量 C.方向 D.以上均正

题型:单项选择题

问题:

控制元件在液压系统中控制和调节液体的()

A.压力

B.流量

C.方向

D.以上均正确

考点:场(厂)内专用机动车辆作业场(厂)内专用机动车辆作业题库
题型:单项选择题

生活中,有些事情看起来不容易做,但只要你用心去做了,不容易做的事也变得容易做了。有些事情看起来很容易做,但真正做起来却不容易。相信你也有这样的体验。

请以“            不容易(或        容易)”为题,写一篇文章。(空格处可填入“帮助他人”、“战胜自我”、“拒绝诱惑”……)要求:①根据自己所写的内容,将题目补充完整;②文体不限(诗歌除外);③文中不得出现真实的地名、校名、人名;④文字不少于600字。

题型:单项选择题

被欧洲西部人们称为“绿色金子”的是(  )

A.牧草

B.橄榄

C.水稻

D.森林

题型:单项选择题

阅读理解

    Teens don't understand the big fuss (小题大做). As the first generation to grow up in a wired world,

they hardly know a time when computers weren't around, and they eagerly catch the chance to spend

hours online, chatting with friends, so what?

    But researchers nationwide are increasingly worried that teens are becoming isolated, less skillful at

persontoperson relationships, and perhaps numb to the cheatings that are so much a part of the email

world."And a teen's sense of self and values may be changed in a world where personal connections can

be limitless," said Shetty Turkle.

     Another researcher, Robert Kraut, said he's worried about the "opportunity costs" of so much online

time for youths.He found that teens who used computers, even just a few hours a week, showed

increased signs of loneliness and social isolation."Chatting online may be better than watching television,

but it's worse than hanging out with real friends," he said.

    Today's teens, however, don't see anything strange in the fact that the computer takes up a centra

l place in their social lives."School is busy and full of pressure.There's almost no time to just hang out,"

said Parker Rice, 17."Talking online is just to catch up time."

     Teens say they feel good about what they say online or taking the time to think about a reply.Some

teens admit that asking someone for a date, or breaking up, can be easier in message form, though they

don't want to do so.But they insist there's no harm.

1. The researchers argue that ________.

A. teens may develop a different sense of values

B. nothing is wrong with teens' chatting online

C. teens can manage their social connections

D. spending hours online does much good to teens

2. Teens think that talking online can help them ________.

A. use computers properly

B. improve their school work

C. develop an interest in social skills

D. reduce their mental pressures

3. The text mainly deals with ________.

A. teens' pleasant online experience

B. teens' computer skills and school work

C. the effects of the computer world on teens

D. different opinions on teens' chatting online

4. Which of the following is TRUE?

A. Teens are more skillful at persontoperson relationships.

B. Teens showed decreasing signs of loneliness and social isolation.

C. Chatting online is worse than hanging out with real friends.

D. Asking someone for a date, or breaking up, can be more difficult in message form.

5. The purpose of the text is to ________.

A. describe computer research results

B. draw attention to teens' computer habits

C. suggest ways to deal with problem teens

D. discuss problems teens have at school

题型:单项选择题

二尖瓣狭窄患者心脏体格检查的特点是()

A.二尖瓣面容

B.收缩期震颤

C.靴形心

D.心界向左下扩大

E.心尖区可闻及舒张期隆隆样杂音

题型:单项选择题

破伤风梭菌的致病机制是()

A.破伤风梭菌通过血流侵入中枢神经系统大量繁殖致病

B.破伤风痉挛毒素侵入中枢神经系统致病

C.破伤风溶血毒素侵入中枢神经系统致病

D.破伤风梭菌产生内毒素引起休克

E.破伤风梭菌引起败血症

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