问题 问答题 简答题

预加氢改串氢时的操作步骤及注意事项?

答案

参考答案:

预加氢改串氢时应先关预加氢的气体循环伐,待容201压力低于重整高分压力时再开大串氢伐,并关闭循环伐。如果重整压力维持不了可从增压机出口补氢入重整系统。串氢操作时要注意避免预加氢氢气串回重整系统。

阅读理解

任务型阅读(共5小题,每小题1分,共5分)

阅读短文,完成76-80题。

There are over 800 boarding (寄宿) schools in the UK. Children of 7 to 18 can go to boarding schools.

    1  

In the UK, boarding schools have three terms in a school year, each student has his or her  subject plan. Besides the usual classrooms and laboratories, the boarding schools also have music rooms, boats, swimming pools, cinemas and theatres for their students.

    2  

There are some rules for the students at boarding schools to obey. Students study and live together. They can’t go outside if they are not allowed to. Most boarding schools have a “light out” time. So when it’s time to go to bed, all the lights in the bedrooms are turned off.

   3   

Nearly all students at boarding schools wear a school uniform. Boys usually wear a shirt and a tie, and girls wear a white blouse, sometimes also a tie and a skirt. As students get older, the rules become less strict.

    4  

In the UK, boarding schools provide students with delicious food. They can choose to have a full English breakfast or simply bread. They can also choose between a meal with no meat and another meal at lunch and dinner. Students can also make themselves something to eat at any time in a kitchen.

从A, B, C, D中选择正确的选项作为文章第2-5段的小标题,并填入76-79四个空格中。

小题1: ___________       

小题2: ___________      

小题3:___________  

小题4: ___________

A.What to eat

B.What to wear

C.What to learn

D.What to obey小题5: Which is the best title for the passage?

A.Boarding schools in the UK

B.How to study in the UK

C.Students work hard in the UK

D.The history of boarding schools in the UK

问答题