当丙烯制冷压缩机停车后，分离系统作紧急停车处理，下列处理正确的是（）。

A．碳二加氢反应器紧急停车

B．脱乙烷塔汽提操作

C．乙烯精馏塔紧急停车

D．脱甲烷塔汽提操作

在空白处填入适当的句子补全对话。

A: Hello, 88261210.

B: Hello. ___1___

A: Yes. This is Lingling speaking.

B: Hi, Lingling. You like listening to the radio. ___2___

A: The radio says it’s going to be sunny these days.

B: Good! What are you going to do for the spring field trip?

A: Nothing much. Why?

B: Our classmates plan to go on a four-day visit to Beijing___3___

A: Sure! I'd love to. Will we go there by bus or by train?

B: ___4___ I love to go by bus. What about you?

A: I love to go by train. You see, going by bus doesn’t cost as much as by train, and going by bus isn’t as comfortable as by train.

B: Yes. Most of the classmates love to go by train. Let's go there by train. ___5___.

A: Yes, I am. And I can go to find out the information about the tickets at once. See you.

B: Thank you. See you.