问题 问答题 简答题

影响初馏塔顶压力因素:原油含水(电脱盐没开情况下)及原油性质变化;冷后温度变化:冷后温度高时塔顶压力上升;换热温度变化:换热温度高时,塔顶压力上升;空冷器入口阀开度大小:阀开度大,压力低。请回答初馏塔顶压力:控制范围、控制目标、相关参数、控制方式?

答案

参考答案:

控制范围:25~85KPa

控制目标:±30KPa

相关参数:塔顶温度、塔顶回流量及含水多少、塔顶回流温度、塔底进料温度。

控制方式:手动调节或DCS塔顶回流与塔顶温度自动串级控制。

阅读理解

阅读理解。

     In Japan, you say "itadakimasu"("I am going to start")before eating, and "gochisosam(deshita)"

("Thank you for the meal")after finishing the meal.

◆Eating rules

     Blowing your nose in public, and especially at the table, is considered bad manners.It is considered

good manners to eat up all the things in your plate.Unlike in some other parts of East Asia, it is

considered bad manner to burp(打嗝).After eating, try to move all your dishes back to the same

position they were at the start of the meal.

◆Drinking rules

     When drinking alcohol(酒), it is a good manner to serve each other, instead of serving yourself.

Check your friends' cups from time to time and refill(重新注满)their drinks if their cups are getting

empty.If someone wants to serve you more alcohol, you should quickly empty your glass and hold

it towards that person.

     While it is considered bad manners to become drunk in some formal restaurants, the same is not

true for other small restaurants, as long as you do not trouble other guests.

     Do not start drinking until everybody at the table is served and the glasses are raised for a drinking

salute(口号), which usually is "kampai".

1.In Japan, you say "itadakimasu" ______.  

A.before eating

B.while eating

C.after eating

D.before drinking

2.All these are good manners in Japan except ______.

A.eat up all the things in your plate

B.after eating, move all your dishes back

C.serve alcohol to each other

D.blow your nose in public

3.From the second paragraph we may know that ______.  

A.in Japan you may burp after eating 

B.in some East Asian countries you may burp after eating

C.in some West Asian countries you may burp after eating

D.in the western countries you may burp after eating

4.If someone wants to serve you more alcohol in Japan, you should______.    

A.serve them quickly

B.refuse it politely

C.say "That's enough"

D.empty your glass and hold it

5.Which of the following is the right drinking rule?  

A.When drinking alcohol, it is a good manner to serve yourself.

B.Check your friends' cups from time to time and refill them if they are empty.

C.It is considered bad manners to become drunk in all the restaurants.

D.Start drinking if only one person is not served.

判断题