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【判断题】
压缩机正常停车的原则是安全、环保、节约。
A. 对
B. 错
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相关试题
【判断题】
装置停车时,应尽最大可能保证设备不超温、不超压,但管线不必理会。
A. 对
B. 错
【判断题】
装置停车时,应尽最大可能保证设备和管线不超温、不超压。
A. 对
B. 错
【判断题】
在乙烯装置正常停车方案中,必须要有安全环保注意事项等内容。
A. 对
B. 错
【判断题】
压缩机停车后还要继续油运24小时,直至轴承温度降至正常。
A. 对
B. 错
【判断题】
丙烯压缩机停车后,继续维持乙烯压缩机平稳运行。
A. 对
B. 错
【判断题】
压缩机停车后还要继续油运至少24小时,直至轴承温度降至正常。
A. 对
B. 错
【判断题】
大检修时,当塔内有机物含量分析合格后即可交付检修。
A. 对
B. 错
【判断题】
在乙烯制冷系统与乙烯精馏塔组成的开式热泵系统中,乙烯机正常停车之前将乙烯收集罐排往裂解气压缩机段间不凝汽调节阀关闭即可。
A. 对
B. 错
【判断题】
三台压缩机均采用最小流量返回线来防止喘振。
A. 对
B. 错
【判断题】
主蒸汽压力突降或中断不会引起压缩机喘振。
A. 对
B. 错
【判断题】
压缩机油路系统油气分离器的作用是对外浮环密封来的密封油进行油气分离。
A. 对
B. 错
【判断题】
压缩机组的润滑油只能起润滑作用。
A. 对
B. 错
【判断题】
离心泵的效率高于往复泵。
A. 对
B. 错
【判断题】
往复泵的扬程理论上是无限大的。
A. 对
B. 错
【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。
A. 对
B. 错
【判断题】
往复泵启动前可以不灌泵。
A. 对
B. 错
【判断题】
备用泵每月盘车一次。
A. 对
B. 错
【判断题】
压力容器停止运行时,一定要将其内部介质排空,对于易燃、易爆、有毒草介质应用氮气或液体置换或中和合格,然后清洗干净。
A. 对
B. 错
【判断题】
安全阀的定压值等于设备的设计压力值。
A. 对
B. 错
【判断题】
压力容器常用的安全附件包括安全阀、爆破片装置、压力表、液位计。
A. 对
B. 错
【判断题】
压力容器的安全阀是压力容器的安全装置。当压力容器的压力超压时,安全阀就会起跳,将压力泄掉,以保护压力容器。
A. 对
B. 错
【判断题】
红外测速仪的优点就是无须在转动部位贴上标签就能够对正在运转的设备进行测速。
A. 对
B. 错
【判断题】
正常操作中,调节阀坏了,应用副线阀控制维持生产,关闭保护阀,让仪表工修阀。
A. 对
B. 错
【判断题】
我装置仪表风调节阀的动力来源是由空分装置提供的,CW是由四循提供。
A. 对
B. 错
【判断题】
一台气动薄膜调节阀,若行程的50%则流过阀的流量也应为50%。
A. 对
B. 错
【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。
A. 对
B. 错
【判断题】
在其他条件一定时,换热器传热面积越大,传递的热量也越多。
A. 对
B. 错
【判断题】
换热器停用时,要先停热流,后停冷流。
A. 对
B. 错
【判断题】
热管式换热器特别适用于温差较大的场合。
A. 对
B. 错
【判断题】
润滑油系统储压器投用时,先将其皮囊充氮气,再将皮囊外侧充油并排气,全开其出口阀。
A. 对
B. 错
【判断题】
正常运行时,复水泵的泵体导淋可以打开排水。
A. 对
B. 错
【判断题】
离心泵机械密封泄漏应立即切换泵,物料进出口阀关闭并倒空置换以便检修。
A. 对
B. 错
【判断题】
启动泵时,应该遵循先启动泵,后开出口阀的原则。
A. 对
B. 错
【判断题】
备用泵盘车的方向一般为泵的运转方向。
A. 对
B. 错
【判断题】
常见的弹簧式安全阀可分为有扳手和无扳手两种。
A. 对
B. 错
【判断题】
当工作介质有毒、腐蚀、粘性大时,应装爆破片代替安全阀,或采用爆破片与安全阀共用的重叠式结构。
A. 对
B. 错
【判断题】
一般条件下,换热器的热负荷必须大于或等于传热速率。
A. 对
B. 错
【判断题】
热负荷是生产上要求换热器在单位时间里所具有的换热能力。
A. 对
B. 错
【判断题】
离心泵的主要机件材质选用、磨损极限符合规程的规定,表明其内部机件质量符合要求。
A. 对
B. 错
【判断题】
一台操作压力为1.2MPa的管壳式换热器,其技术资料中应具有压力容器使用许可证。
A. 对
B. 错
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Q3: Why is it considered bad luck to see a black cat crossing one’s path?___
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Q4: According to the passage, what will bring people good luck?___
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Q4: How will the new high-speed train affect the man?___
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Q2: What is the present situation about Americans’ commuting to work?___
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Q3: Why does Steven choose to have an extreme commute?___
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【单选题】
Q4: Which of the following is the disadvantage of long commutes?___
A. Traffic jams .
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D. A tiring and boring trip .
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Q1: What did Katy like about Jason’s last Halloween party?___
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【单选题】
Q2: What is the actual reason that Katy doesn’t want to attend Jason’s party?___
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【单选题】
Q3: What is special about Linda’s party?___
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【单选题】
Q4: What will Katy do to solve her problem?___
A. Go to Jason's party .
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【单选题】
Q1: What is special about this year’s Black Friday shopping?___
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Q2: Why did some stores open at midnight on Thanksgiving night?___
A. To attract young customers .
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【单选题】
Q3: How many Black Friday shoppers were reported to go to the shops at midnight this year?___
A. 24 percent .
B. 37 percent .
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【单选题】
Q4: What can we learn about the 15-year-old Jenny?___
A. She and her cousins went back home at midnight .
B. She liked the traditional 4 a.m. Black Friday.
C. She preferred midnight shopping to early  morning shopping .
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Q1: Why did the woman decide to do a triathlon?___
A. Because she did it in college .
B. Because she wanted to be tough .
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D. Because her sister said it was good for her .
【单选题】
Q2: When did the man first do a triathlon?___
A. Last year .
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C. Last week .
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Q3: How does the man feel about running?___
A. Boring.
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Q4: Why doesn’t the woman like swimming in the triathlon?___
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Q1: What is the ratio of positive to negative emotions that can make a person happier?___
A. 1:3.
B. 3 :1.
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Q2: What is the most exciting finding about increasing positive emotions?___
A. It improves relationships .
B. It leads to greater success .
C. It helps develop creativity .
D. It contributes to good health .
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Q3: What does the speaker say about negative feelings?___
A. People should turn every negative feeling  around .
B. Negative feelings can sometimes have  positive effects .
C. Negative feelings often cause people to  make mistakes .
D. People should never show negative feelings  in public places .
【单选题】
Q4: What is the main idea of the passage?___
A. People should learn to manage their  emotions .
B. People should be patient with their  negative feelings .
C. People should learn to analyze causes of  unhappiness .
D. People should identify as many positive  feelings as possible .
【单选题】
Q1: What are the man and woman talking about?___
A. Whether nature is magical and kind .
B. Whether nature is powerful and full of risks .
C. Whether Christopher was well prepared for the trip .
D. Whether Christopher's trip to Alaska was  worthwhile .
【单选题】
Q2: What can we learn about Christopher?___
A. He made a film about his trip to Alaska .
B. He wrote a story about his trip to Alaska .
C. He died while having an adventure in Alaska .
D. He learned how powerful and risky Alaska was .
【单选题】
Q3: What does the woman think about Christopher taking the trip to Alaska?___
A. He was too foolish .
B. He was really romantic .
C. He had a very kind heart .
D. He had a spirit for trying things .
【单选题】
Q4: Which of the following is NOT mentioned as something that would have saved Christopher’s life?___
A. A gun to hunt .
B. The map of the area .
C. Emergency food supplies .
D.
E. mergency communication equipment .
【单选题】
Q1: What speed can an avalanche reach within five seconds of taking off?___
A. At 8 miles an hour .
B. At 18 miles an hour .
C. At 80 miles an hour .
D. At 88 miles an hour .
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