【多选题】
[135]乙烯机C-601四段出口与丙烯换热的换热器有___。
A. E-601
B. E-602
C. E-603
D. E-604
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相关试题
【多选题】
[136]液压系统中蓄压器的作用___。
A. 稳定压力
B. 减少功率消耗
C. 补偿渗漏
D. 吸收压力脉冲和冲击力
【多选题】
[137]计量泵的脉冲阻力器的作用___。
A. 降低系统的能耗
B. 减小除去水锤对系统的危害
C. 保护接头、弯头不受压力波动的冲击
D. 降低温度
【多选题】
[138]机械密封相对于填料密封的优点___。
A. 密封性好
B. 使用寿命长
C. 价格便宜
D. 使用温度范围广
【多选题】
[139]开车阶段，干气密封使用原则___。
A. 隔离气投用无顺序要求
B. 必须先投一级密封气
C. 先投干气密封再投油路
D. 必须先投二级密封气
【多选题】
[140]油运阶段，干气密封使用原则___。
A. 隔离气必须投用
B. 如果机壳不带压，一二级密封气可以关
C. 干气密封可以不投用
D. 隔离气可以不投用
【多选题】
[141]停车阶段，干气密封使用原则___。
A. 先停干气密封再停油路
B. 先停油路再停干气密封
C. 先停隔离气再停润滑油
D. 先停润滑油才能停隔离气
【多选题】
[142]压缩系统使用的孔板流量计的是___。
A. FI20001
B. FI20201
C. FI22401
D. FIQ60018
【多选题】
[143]下列是自励式调节阀的是___。
A. PCV62201
B. PCV52202
C. PCV22201
D. PDV50019
【多选题】
[144]裂解装置的干气回收系统回收的干气主要组分是___
【多选题】
[145]干气预分馏塔T-408作用___。
A. 分离乙烯与乙炔
B. 分离乙烯与乙烷
C. 提浓富乙烯气
D. 提浓乙烷气
【判断题】
[1]在正常运行中，润滑油泵备用油泵都应处于手动位置。
【判断题】
[2]三台压缩机均采用最小流量返回线来防止喘振。
【判断题】
[3]油冷却器出口温度不能低于40℃。
【判断题】
[4]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。
【判断题】
[5]压缩机组的润滑油只能起润滑作用。
【判断题】
[8]再生气向上通过裂解气干燥器床层而再生。
【判断题】
[9]再生气向上通过液相干燥器床层而再生。
【判断题】
[11]“三不动火”的内容之一是没有火票不准动火。
【判断题】
[12]启泵时应遵循先启泵，后开出口阀的原则。
【判断题】
[13]精馏过程既包括传热过程也包括传质过程。
【判断题】
[14]乙烯压缩机的负荷主要由乙烯装置负荷和分离用户换热状态影响。
【判断题】
[15]复水液位低报时，辅助水泵自启动。
【判断题】
[18]在吸收塔中溶质和溶剂一定时，溶质在溶剂中的溶解度与温度和压力均有关。
【判断题】
[19]投用中后冷凝器的喷射器时，应先投二级，再投一级。
【判断题】
[20]当孔板被堵住时，仪表显示流量将比实际值小。
【判断题】
[22]透平暖机转速一般是300-500rpm。
【判断题】
[23]流体湍动越激烈，损失的能量越大。
【判断题】
[24]在传热时，并流时的平均温差大于逆流时的平均温差。
【判断题】
[25]采用两台型号相同的离心泵并联操作可提高扬程，串联可增大流量。
【判断题】
[26]润滑油过滤器压差达到120KPa时需切换。
【判断题】
[27]碱洗塔进料加热器E-206是是用中压蒸汽加热的。
【判断题】
[28]实际塔板数与理论塔板数之比，称为板效率。
【判断题】
[29]超高压蒸汽在压缩区的用户是C-501和C-601。
【判断题】
[30]当设备中的流体处于静止状态时，其阻力为零，因此，此时流体的粘度为零。
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Both the kids and their parents ____ English, I think. I know it from their accent.
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You had better ___ a doctor as soon as possible.
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Young ___ he is, he knows how to get along with others.
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He succeeded ___ out a lot of things entirely new in the world.
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It took me a long time to ___ the disappointment of failing the exam.
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She ___ 100 pages of the book today.
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One cannot learn a foreign language well ___he studies hard.
A. unless
B. if
C. as
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A large number of people___ present at the meeting, which was out of our expectation.
A. was
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When the girls saw the funny man, they couldn't ___ laughing.
A. keep from
B. keep on
C. keep away
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【单选题】
We are glad that we finally managed to get into contact ___ them.
A. at
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This kind of plant___a lot of water at all times.
A. assumes
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Look! Here ___ the famous player.
A. comes
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A. red sports new
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I couldn't find my English-Chinese dictionary___.
A. anywhere
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The plane was about to___, and yet I left my ticket behind.
A. take off
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John succeeded ___ what he wanted.
A. to get
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A. for
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A. salary
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_____of them thinks that is a good idea.
A. Anyone
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C. None
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Don't be too ___about things you're not supposed to know.
A. strange
B. amusing
C. curious
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It was in 1969 ___the American astronauts succeeded in landing on the moon.
A. when
B. the moment
C. which
D. that
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___people in the world are sending information by e-mail every day.
A. Several million
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C. Several millions
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He___less time reading stories about film stars than before.
A. takes
B. spends
C. costs
D. pays
【单选题】
Selecting a mobile phone for personal use is no easy task because technology___so rapidly.
A. is changing
B. has been changed
C. will have changed
D. will change
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The taxi driver always reminds passengers to ___their belongings when they leave the car.
A. keep
B. catch
C. hold
D. take
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Little Tom is used to getting up ___eight every morning.
【单选题】
If the doctor had been available, the child _______.
A. would not die
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C. might not die
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If Mary___shopping this afternoon, please ask her to write a shopping list first.
A. will go
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D. has gone
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These desks and chairs ___to the children in the mountain villages next week.
A. are sent
B. will send
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Every society has its own peculiar customs and ___of acting.
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C. ways
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China is ___the Great Wall.
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