问题 问答题 简答题

聚合首釜反应温度出现下滑时如何调节?

答案

参考答案:

(1)当温度下滑幅度不大时,可采用提高进料温度的办法进行调节;

(2)当温度下滑较大时,采用提高丁油浓度及进料温度相结合的方法进行控制,即先将进料温度提高至一定值,再提高丁浓,使其反应达到正常;

(3)以上措施仍不能使温度得到控制,应减小丁二烯进料量,适当提高催化剂用量,若长时间温度不回升,应将首釜料退掉,查明原因重新进料。

单项选择题 A1/A2型题
阅读理解

  From the very beginning, Martin felt that he was bound up with(与……紧紧地在一起)his lovely little patient. One day, following some tests , Betty gave the doctor a big hug(拥抱).

  A few months later the doctor removed not only the tumour(肿瘤), but also the entire lower left side of Betty’s gum(牙龈)and jawbone. Because Betty was so young, Martin was hopeful that her jawbone might regenerate.

  Within three months, Betty’s tumour grew as large as an orange, changing the natural appearance of the left side of her small, delicate ( =" thin;" not strong)face. Soon she couldn’t even close her mouth, and as her eating problems worsened, Betty ‘s weight dropped from 20 kilos to 15. Martin knew from experience that it might invade the brain.

  The only other possibility was thorough radiation therapy (放射疗法). Night after night, Betty's father gave her injection, but the tumour remained as big as ever. Then one evening. Morgan noticed that the tumour had begun to change. It was actually becoming smaller! For two months her tumour appeared to be going away for ever. In the coming months, Betty’s tumour continued to appear. She was able to eat solid food once again. Her jawbone was regenerating. The tumour was gone.

 小题1:If Betty’s jawbone didn’t regenerate, the doctors ________ .

A.would rebuild her jaw

B.would continue the treatment

C.would use new medicine

D.could do nothing else 小题2:If the brain should be invaded, the result would ________.

A.prevent her growth

B.reduce her weight

C.cause her brain damaged

D.affect her eyesight 小题3:What did the doctors do two months later?

A.They continued their observations.

B.They gave up the operation on Betty.

C.They found out what caused Betty’s strange disease.

D.They declared that Betty’s strange disease was cured.