【单选题】
[单选题]第997题:导致乙烯装置管式裂解炉露点腐蚀的主要原因是烟气中含有___。
A. 五氧化二磷
B. 三氧化硫.
C. 氯化氢
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答案
B
解析
暂无解析
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[单选题]第998题:当有毒气体在空气中的浓度很高时.应选用___式防毒护具。
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[单选题]第999题:当离心泵机械密封泄露较大时,下列处理方法正确的是___。
A. 切换泵并报检修
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【单选题】
[单选题]第1000题:管道油漆施工需有要防火、防冻、防雨措施,且适宜的的环境温度是___。
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[单选题]第1001题:急冷油塔汽油回流带水有何危害___。
A. 顶温过低,大量轻油以及水混入急冷油造成急冷油泵不上量,装置停车的危险
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[单选题]第1002题:保护听力而言对听力不会损失,一般认为每天8小时长期工作在___分贝以下。
A. 90
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[单选题]第1003题:在时间或空间上失去控制的燃烧称为___。
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[单选题]第1004题:危险化学品、烟花爆竹、民用爆炸品生产企业重大危险深没有检测、评估、监控措施的,不得颁发___。
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[单选题]第1005题:高心泵验收试车时渐动轴承温度不应大于___℃。
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原料中硫含量高于___ppm后,会影响辐射段炉管的寿命。
A. 300
B. 100
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裂解炉日常现场操作中.___操作有噪奇危击。
A. 超高压蒸汽并网
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废水经生物氯工艺、吹脱工艺等处理可以脱除___
A. 领氛
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A. 脏液泄漏
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进入受限空间作业,设备内要做氧含量分析,其氧合量值不得低于___%。
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A. 一
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急冷油循环泵采用机械密封的原因是___。
A. 机械密封性能好
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环境污热事故是指由于违反环境保护法规的经济、社余活动与行为以及意外园素的影响或不可抗拒的自然灾害等原因使环境受到污热,国家重点保护的野生动菌物、向然保护区受到破坏,人体健康受到居害社金经济与人民财产受到损失造成不良社会影响的___事件。
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静电的危害有___。
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根据事微情景应急处置结束后所开展的事故损失评估、事故原西调查、事故现场清理和相关善后工作就是___。
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裂解炉烧焦过程中基本上分为两步,一步为炉管内表面较为松软的焦被反应,二步为炉管内较为坚硬的塘在大量空气下反应。酒易发性护香过热点的胜___。
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( ) 27. What does the prince do after the fox tells him a secret? A.He cares more about a flower and a sheep. B.He meets many more strange adults on other planets. C.He realizes his love for the rose and he goes back to his planet.   D.He discovers interesting things such as a snake, other roses and a fox.
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【单选题】
( ) 28. What does "The little Prince" mainly talk about? It' s about _________. A.the adult world B.the planet B -612 C.a rose and a fox D.the adventure of a young prince
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( ) 29. What is the writer's main purpose(目的)in writing this passage?    A.To tell the readers his life story.    B.To tell people what kind of person his father was.    C.To tell the readers what present he got from his father.    D. To let people know how poor he was.
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( )30 Why did the father not ask his son not to do this and do that?    A.Because he felt quite confident of his son.    B.Because he was born from a poor family.    C.Because he was a man of few words.    D.Because he didn't want to be much too strict with his son.
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【单选题】
( ) 31. What would someone learn from this passage?    A.How to live by oneself. B.How to stand on one's own feet.    C.What a good father should do. D.What the self-important is like.
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【单选题】
( ) 32. What may be the proper Chinese for the underlined part in the passage?    A.闲暇时光 B.学费 C.精神空虚 D.经济不足
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【单选题】
( ) 33. It’s good for children to ________ on the Internet. A. give password to others B. go into a chat room as they’d like to C. give out a credit card number D. get useful knowledge and information
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【单选题】
( ) 34. The underlined phrase “leak out” in the third paragraph may mean “________.” A. give away B. give out C. leave out D. put away
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【单选题】
( ) 35.If your parents don’t agree, never ________. A. read anything on the Internet B. relax in your free time C. have a face-to face meeting with anyone you met online D. treat other people as you’d like to be treated
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【单选题】
( ) 36. This passage is mainly about “________”. A. Internet Safety Rules B. Surfing on the Internet C. Information on the Internet D. How to use Computers
A. A
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【单选题】
( ) 37. When was canned food invented? A. In 1870.          B. In 1810. C. In 1902.          D. In 1926.
A. A
B. B
C. C
D. D
【单选题】
( ) 38. After the trip to the Arctic, Clarence Birdseye invented ____________. A. canned food             B. can openers C. frozen food           D. air conditioning
A. A
B. B
C. C
D. D