阳离子交换器的出水穹形孔板一般采用()材质。A、碳钢衬胶 B、碳钢 C、聚氯乙烯 D

题型:单项选择题

问题:

阳离子交换器的出水穹形孔板一般采用()材质。

A、碳钢衬胶

B、碳钢

C、聚氯乙烯

D、不锈钢

考点:化学水处理工化学水处理工(高级)化学水处理工(高级)题库
题型:单项选择题

阅读理解。

     Jack is a twenty-year-old young man. Two years ago, when he finished middle school, he found

work in a shop. Usually he works until ten o'clock in the evening. He is very tired when he gets home.

After a quick supper he goes to bed and soon falls asleep. His grandma who lives downstairs is satisfied

with (满意) him.

     One day, on his way home, he met Mary. They were both happy. He asked the girl to his house, she

agreed happily. He bought some fruit and drinks for her. And they talked about their school, teachers,

classmates and their future (未来). They talked for a long time.

     "Have a look at your watch, please," said the girl. "What time is it now?"

     "Sorry, something is wrong with my watch," said Jack. "Where's yours?"

     "I left it at home."

     Jack thought for a moment and found a way. He began to stamp his foot on the floor, "Bang! Bang!

Bang!"

     The sound woke his grandma up. The old woman shouted downstairs, "It's twelve o'clock in the

night, Jack. Why are you still jumping upstairs?"

1. Jack was ________ when he finished middle school. 

A. sixteen  

B. eighteen  

C. twenty  

D. fifteen

2. The old woman is satisfied with Jack because ________. 

A. he's her grandson      

B. he's clever 

C. he can keep quiet      

D. he gets home on time

3. From the story, we can know that Mary is Jack's ________.

A. classmate      

B. colleague (同事)    

C. aunt      

D. wife

4. The word "stamp" in the story means ______ in Chinese. 

A. 盖印     

B. 跺     

C. 贴邮票     

D. 承认

5. Jack stamped his foot on the floor in order (为了) ________. 

A. to wake his grandma up 

B. to make his grandma angry 

C. that his grandma was going to tell him the time 

D. that his grandma was going to buy him a watch

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假设某建筑安装工程中,工具、器具及生产家具购置费为180万元,建安工程费为1800万元,工程费用为1980万元,工程建设其他费用为380万元,基本预备费率为5%,则该建筑安装工程基本预备费为()万元。

A.90

B.99

C.118

D.138

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( )的机身下部有一门架,可供运输车辆通行,这样便可使起重机和运输车辆在同一高程上行驶。

A.塔式起重机

B.门式起重机

C.缆式起重机

D.履带式起重机

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血液循环停止多久后,脑干功能将会丧失()

A.15s

B.45s

C.1min

D.3min

E.4min

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