相关试题
【判断题】
正常操作时，负荷波动会造成反应器出口分析不合格
【判断题】
生产稳定时，乙烷裂解炉的负荷相对稳定，其负荷的提降依据是根据乙烯精馏塔的塔釜液位，液位高则提乙烷，反之则降乙烷
【判断题】
前脱丙烷工艺分离过程中，乙烯装置的乙烯损失主要是碳二加氢反应器的副反应所造成的
【判断题】
碳二加氢反应器进料浓度对反应器的运行周期没有影响
【判断题】
碳二加氢反应器进料中如含有二氧化碳,不但会使反应器中的催化剂活性下降,甚至失活,而且会使
【判断题】
乙炔分压与绿油生成量有关，对催化剂再生周期有影响，而且直接影响催化剂活性
【判断题】
冷区正常停车时，火炬长明线改由高压甲烷提供
【判断题】
热区正常停车前，要将不凝气停止放火炬，改返裂解气压缩系统
【判断题】
正常停车前，各干燥器至少有一台再生完毕，反应器应有备用台
【判断题】
冷区正常停车前，乙烯精馏塔不凝气停返裂解气压缩系统
【判断题】
热区系统导液之前必须先将水排尽后才能导液
【判断题】
进入设备内部检修作业前，应打开设备人孔或通风孔，保持设备内部空气流通
【判断题】
动火人在接到动火许可证后，应逐项检查防火措施，如不符合防火措施要求，动火人也必须按要求动火
【判断题】
氢气在空气中的爆炸极限（V％）是4.0-74.2%
【判断题】
甲烷在空气中的爆炸极限（V％）是2.5～80%
【判断题】
在膨胀机停车时，立即将备用泵由自动打为手动，然后停润滑油泵
【判断题】
冷区正常停车时，燃料气系统改由高压甲烷提供
【判断题】
正常停车前要确认碳三加氢反应器已完全再生
【判断题】
脱丁烷塔正常停车时尽量避免大量轻组分带入粗汽油罐
【判断题】
乙烯装置不含水的物料均可直接排放至火炬
【判断题】
火炬最大排放量的确定原则是按事故状态时各系统排出的全部气体总量来考虑
【判断题】
正常停车时,必须先停碳三加氢反应器,再停甲烷化反应器,最后再停碳二加氢反应
【判断题】
红外测速仪能够对正在运转的设备进行测速
【判断题】
冷泵密封腔有密封油系统的低温泵在预冷后注入密封液和隔离液
【判断题】
塔釜热源流量阀全开，塔釜仍加不上热，可判断再沸器需切出清理
【判断题】
塔釜再沸器切换时，首先必须对备用台进行预热，预热合格后才能通入液相物料
【判断题】
干燥器切换时，确认备用台进出口阀已完全打开，才能切出在用台
【判断题】
干燥器再生步骤中冷吹的目的是用甲烷将床层冷却
【判断题】
固定管板式换热器的使用条件是两流体的温差较大、腐蚀性较大的物料
【判断题】
泵轴封的作用是防止高压液体从泵壳内沿轴的四周而漏出，或者外界空气以相反方向漏入泵壳内
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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
D. Yes, I'm really sorry
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-I will,______.
A. that's all right
B. thank you
C. all right
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-Hello, may I speak to Zhao Hua?_____.
A. My name is Zhao Hua
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___This is Mr Smith speaking now.
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B. Who is that
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- I was worried about my maths, but Mr. Brown gave me an A.___
A. Don't worry about it.
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C. Mr. Brown is very good.
D. Good luck to you！
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A. I'd like to
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A. Certainly
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A. Who are you?
B. Sorry, he isn't in.
C. Thank you very much.
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A. No, I won't
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A. I'm so glad
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A. her teacher worked hard.
B. Susan worked hard.
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- Peter, don't step on the grass_______.
A. It doesn't matter
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- How was your journey to Paris? - ____
A. It went very well.
B. I flew there.
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A. All right
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- Happy birthday to you! ___!
A. Happy birthday to you
B. I'm very glad
C. That's all right
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- Have a cup of tea, ____? Thanks a lot.
A. don't you
B. haven't you
C. shall we
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- Thank God．It's Friday again．A nice weekend!___.
A. Me too
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— Write to me when you get home. OK, I ______.
A. must
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Tom is so talkative. I’m sure you'll soon get tired ___ him.
A. of
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I don't know ____ to deal with such matter.
A. what
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___ is your girl friend like? She is very kind and good-looking.
A. How
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He ___ driving me home, even though I told him I lived nearby.
A. insisted on
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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
B. yet
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I am not used to speaking ___ public.
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I didn’t know what to do, but then an idea suddenly ___to me.
A. appeared
B. happened
C. occurred
D. emerged
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Measles （麻疹） ___ a long time to get over.
A. spend
B. spends
C. take
D. takes
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A pair of spectacles ___ what I need at the moment.
A. is
B. are
C. has
D. have
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— Five days ___ too long for me to wait.
A. was
B. were
C. is
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You had better ___ a doctor as soon as possible.
A. seeing
B. saw
C. see
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The boy is not happy at the new school. He has ___ friends there.
A. few
B. a few
C. little
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I fell and hurt myself while I ___ basketball yesterday.
A. was playing
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Tom ___ more than twenty pounds on the novel.
A. spent
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C. cost
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Don't forget ____ the window before leaving the room.
A. to have closed
B. to close
C. having closed
D. closing
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Twenty people were___ wounded in the air crash.
A. quickly
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The top of the Great Wall is ___ for five horses to go side by side.
A. wide
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We’ve missed the last bus. I'm afraid we have no ___but to take a taxi.
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