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问题 问答题 简答题

顶循回流流量过大有何缺点？

答案

参考答案：

（1）冷却器负荷加大；

（2）机泵负荷大或超载；

（3）塔顶负荷过重，影响回流效果，严重时将引起淹塔事故；

（4）导致焦炭塔压力超高。

填空题

用单词的适当形式填空。

1. My son is ______ (terrify) of the dark. He always slept with the bedroom light on.

2. He is a ______ (fun) person. He always tells jokes to us.

3. The man is very ______ (quietly). He never talks too much.

4. She ______ (use) to have short curly hair, but now she has long straight hair.

5. Anyone interested in ______ (join) the club should contact us at the address below.

6. When I was a child, I used ______ (go) out for a picnic.

7. Be sure ______ (give) your family my regards.

8. I am afraid of ______ (take) exams. What about you?

9. His teacher asked him to practice ______ (listen) whenever he had time.

10. My father used to swim in the river when he ______ (be) in Shanghai.

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单项选择题

交换二次积分的积分顺序：设f、(x，y)连续，则


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