问题 单项选择题

在离心式循环氢压缩机转速不变的情况下,要提高二段反应系统循环氢流量,可通过()。

A、开大二段反应器出口至硫化氢汽提塔塔底处换热器旁路和调节阀开度

B、关小二段反应器出口至硫化氢汽提塔塔底处换热器旁路和调节阀开度

C、提高循环氢压缩机透平蒸汽压力

D、降低循环氢压缩机透平蒸汽压力

答案

参考答案:A

读图填空题
阅读理解

阅读理解。

John: Here's a good shop. Shall we buy mother's birthday present here?

Mary: Yes, that's a good idea. Shall we go inside?

Tom: No. Let's look in the window. Shall we buy her a sweater?

Anne: Er, no. It'll soon be summer. Let's buy her a blouse to wear. There's a nice one in the window.

John: No, she has two blouses. Let's buy a ring.

Mary: Oh, no! They're diamond rings. Look at the price. The cheapest is $15.

John: A real diamond ring is at least $500.They only look like diamonds.

Tom: Shall we buy a table? It's only $15.

Anne: It doesn't look good, just like a big box. Mum likes chairs.

Tom: But they haven't any here.

Mary: What about a pen? So cheap! Only $10.

John: She has a lot of pens and pencils. All of them are new.

Tom: Oh, look here. These flowers are beautiful.

Mary: They aren't real and will never die.

John: And they're the cheapest of all these things. Yes, let's buy them.

Anne: All right.

1. Who finds the shop to buy the present first?

A. John.        

B. Anne.        

C. Tom.        

D. Mary.

2. Who wants to buy a blouse but not a sweater?

A. John.      

B. Anne.        

C. Tom.      

D. Mary.

3. Why don't they buy the pen?

A. Because it looks so bad.      

B. Because Mother has many pencils.

C. Because it's too cheap.        

D. Because Mother doesn't need pens.

4. How much are the flowers?

A. At least $10.        

B. Less than $10.

C. About $15.        

D. Only $15.

5. Which of the following things are sold in the shop?

A. It sells flowers, rings, tables and sweaters.

B. It sells rings, coats, blouses and flowers.

C. It sells blouses, tables, chairs and pens.

D. It sells sweaters, real flowers, tables and rings.