装置停循环水时处理方法正确的是（）。A、切断热源，加大塔顶回

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问题单项选择题

装置停循环水时处理方法正确的是（）。

A、切断热源，加大塔顶回流量

B、加大塔顶、塔底采出，降低塔压

C、停止进料，塔在全回流状态下操作

D、原料返回罐区，切断采出，保持塔内一定温度、压力、液面

答案

参考答案：D

填空题

用所给词的适当形式填空.

1. Jim did___________ ( bad) of all the boys.

2. I was sorry __________ (hear) that he had a cold last week.

3. I hope you are in good___________ (health).

4. ___________(luck) , I passed the exam this time, and I was very happy.

5. To my _________(surprise), my mother took the train to my school yesterday.

6. lt was a __________ (disappoint) result, Lucy's friends were ___________ ( disappoint) to see it.

7. I didn't watch TV until I finish___________( do) my homework.

8. My Spanish teacher said my __________(listen) was good.

9. Mary said she was very ___________(luck) to get the prize.

10. He found science was__________( real) difficult.

多项选择题

单GGSN、单传输、单路由器GPRS接入有哪些优点（）.

A、GPRS企业接入最简单的方案

B、客户端投资小，组网简单

C、可满足一般企业的需求

D、不容易引起业务中断