相关试题
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汽轮机热井液位至3100mm时，汽轮机跳闸
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汽轮机设备静态试验必须在动态试验合格后方可进行
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汽轮机喷油试验可在汽轮机定速并网前或汽轮机正常运行中进行
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所有汽轮机保护应在机组冲转前投入，低真空保护除外
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汽轮机OPC超速试验合格后方可进行电超速或机械超速试验
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汽轮机调速汽门活动性试验目的是检验调速汽门关闭是否严密
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汽轮机的转动部分包括轴、叶轮、动叶栅、联轴器和盘车装置等
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从干饱和蒸汽加热到一定温度的过热蒸汽所加入的热量叫过热热
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调速系统由感受机构、放大机构、执行机构、反馈机构组成
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企业标准化是围绕实现企业生产目标，使企业的全体成员、各个环节和部门，从纵向到横向的有关生产技术活动达到规范化、程序化和科学化
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具体地说，企业标准化工作就是对企业生产活动中的各种技术标准的制定
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汽轮机负荷增加时，流量增加，各级的焓降均增加
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水蒸气的形成经过五种状态的变化，即未饱和水、饱和水、湿饱和蒸汽、干饱和蒸汽和过热蒸汽
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危急保安器常见的形式有偏心飞环式和偏心飞锤式
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汽轮机常用的联轴器有三种，即刚性联轴器、半挠性联轴器和挠性联轴器
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当流体流动时，在流体层间产生阻力的特性称为流体的黏滞性
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从辐射换热的角度上看，一个物体的吸收率小，则辐射能力强
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目前，火力发电厂防止大气污染的主要措施是安装脱硫装置
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火力发电厂的循环水泵一般采用大流量、高扬程的离心式水泵
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由于受客观条件限制，在运行中暂时无法解决、必须在设备停运时才能解决的设备缺陷，称三类设备缺陷
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工作结束前，如必须改变检修与运行设备的隔离方式，必须重新签发工作票
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工作负责人应对工作许可人正确说明哪些设备有压力、高温和有爆炸危险
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工作票签发人、工作票许可人、工作负责人对工作的安全负有责任
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液体流动时影响能量损失的主要因素是流体的粘滞性
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离心泵的工作点在QH性能曲线的下降段才能保证水泵运行的稳定性
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汽轮机机组参与调峰运行，由于负荷变动和启停频繁，机组要经常承受剧烈的温度和压力变化，缩短了使用寿命
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汽轮机变工况时，级的焓降如果不变，级的反动度也不变
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汽轮机冷态启动冲转的开始阶段，蒸汽在金属表面凝结，但形不成水膜，这种形式的凝结称珠状凝结
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凝汽式汽轮机当蒸汽流量增加时，调节级焓降增加，中间级焓降基本不变，末几级焓降减少
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汽轮机内叶轮摩擦损失和叶高损失都是由于产生涡流而造成的损失
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汽轮机供油系统的主要任务是保证调速系统用油，供给机组各轴承的润滑和冷却用油，及供给发电机密封用油
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蒸汽的初压力和终压力不变时，提高蒸汽初温能提高朗肯循环热效率
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蒸汽初压和初温不变时，提高排汽压力可提高朗肯循环的热效率
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降低排汽压力可以使汽轮机相对内效率提高
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蒸汽与金属间的传热量越大，金属部件内部引起的温差就越小
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汽轮机金属部件承受的应力是工作应力和热应力的叠加
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汽轮机的寿命包括出现宏观裂纹后的残余寿命
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汽轮机在稳定工况下运行时，汽缸和转子的热应力趋近于零
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汽轮机的节流调节法也称质量调节法。只有带上额定负荷，节流门才完全开启
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汽轮机冷态启动定速并网后加负荷阶段容易出现负胀差
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- That's a beautiful cat. I wonder who it belongs to.____
A. It belongs to the
B. rowns. B.The cat is my favourite too.
C. Mind your own business.
D. I can't say anything more.
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A. You'd better buy a watch.
B. It's three thirty by my watch.
C. Can you see the clock?
D. It's late I think.
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A. The actress is bad.
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___ No, thanks. I'm just looking around. I'll let you know if I want anything.
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B. What will you buy?
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D. Do you like to look around?
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- Hello, Peter. What do you do?____
A. I am fine.
B. I am not sick.
C. I am a student from Bonn University.
D. I came from Bonn University.
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-Excuse me; can I have a seat here?___
A. Be hurry.
B. Come on.
C. Yes, please.
D. Do you mind?
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- Shall we sit up here on the grass or down there near the water?___
A. I'd rather stay here if you don't mind.
B. Sorry, I don't like neither.
C. Certainly, why not？
D. Yes, we like these two places.
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- What do you do on Sunday?___
A. I 'm a teacher.
B. I play football.
C. You are a student.
D. They clean rooms.
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- Our class won the girls' relay race in our school's sports meeting.___
A. That's right.
B. Thanks a lot.
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A. Hold on. I'll get her.
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C. Yes, she lives here.
D. Yes, what do you want?
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- I am afraid I can't return the book to you before Friday. ___
A. Don't be afraid
B. Be careful
C. Not at all
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- I really don't know how to thank you enough. ___.
A. No problem
B. Think nothing of it
C. Not at all
D. It doesn't matter
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A. No, you needn't
B. No, you mustn't
C. Yes, you will
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-I'm sorry to hear that you failed in the exam______.
A. Not at all
B. Oh, thank you.That's very kind of you
C. You are welcome
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A. that's all right
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___This is Mr Smith speaking now.
A. Who are you
B. Who is that
C. Who are you calling
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- I was worried about my maths, but Mr. Brown gave me an A.___
A. Don't worry about it.
B. Congratulations! That's a difficult course.
C. Mr. Brown is very good.
D. Good luck to you！
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-Would you go to the concert with me?___, but I'm very busy now.
A. I'd like to
B. Sure
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- Hi, Jim! Nice to meet you.____.
A. Certainly
B. Many thanks
C. OK
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A. Who are you?
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C. Thank you very much.
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A. No, I won't
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C. Yes, please
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A. I'm so glad
B. I'm sorry
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- I heard Susan surprised her teacher by working hard. Yes, ___
A. her teacher worked hard.
B. Susan worked hard.
C. the teacher was surprising.
D. Susan was surprised.
【单选题】
- Peter, don't step on the grass_______.
A. It doesn't matter
B. I can't do it
C. Don't worry
D. Sorry, I won't do it again
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- How was your journey to Paris? - ____
A. It went very well.
B. I flew there.
C. I love Paris.
D. Thank you for asking.
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A. All right
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A. Happy birthday to you
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— Write to me when you get home. OK, I ______.
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Tom is so talkative. I’m sure you'll soon get tired ___ him.
A. of
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A. what
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___ is your girl friend like? She is very kind and good-looking.
A. How
B. What
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He ___ driving me home, even though I told him I lived nearby.
A. insisted on
B. insisted at
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We came finally ___the conclusion that she has been telling lies all the time.
A. of
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I won’t make the___mistake next time.
A. like
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He ___lives in the house where he was born.
A. already
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C. still
D. ever
