什么叫离子交换器的小反洗?其目的是什么?

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问题:

什么叫离子交换器的小反洗?其目的是什么?

考点:电厂水化验员考试电厂水化验员考试题库
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Most Americans enjoy moving from place to place. For example, they often drive their cars 120 to 160 kilometres away just to have dinner with a friend or even fly to London or Paris just to watch a football match. In some states only one person in five lives in a place for more than five years. One may be born in one city, and go to school in another. He may finish his middle school in two or three cities, and then go to college far across the country. When he begins to work, he may possibly move from job to job. Moving from one job to another, which is called “job-hopping”, can be seen in many places in the United States.

Job-hopping does good to workers because every change of a job gives them a chance to get better pay. And job-hopping also gives bosses the chance to get new ideas and skills from him or her.

小题1:From this passage, we can see Americans often travel to _______________.

A.have dinner with their friends

B.go shopping

C.watch a football game

D.enjoy themselves小题2:Which of the following is true?

A.About 20% of the people stay in one place for over five years.

B.Children have to finish middle school in one place.

C.People go to the nearest college.

D.When people begin to work, they don’t move any more.小题3:Job-hopping means “_______________”.

A.looking for a job

B.having a job

C.changing jobs often

D.losing a job小题4:In the USA job-hopping _______________.

A.is very popular

B.helps young people go to college

C.helps workers in traveling

D.helps students begin to work小题5:The writer thinks job-hopping _______________.

A.does good only to the workers

B.does good only to the boss

C.must be stopped

D.is helpful

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施工项目部编制的《安全文明施工实施细则》由施工项目部经理批准。

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同步卫星与地心相距r,运行速率为,加速度为;地球赤道上的物体随地球自转的加速度为,第一宇宙速度为,地球半径为R。下列关系式正确的是(   )

A.

B.

C.

D.

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小儿风湿热与类风湿热的主要区别是

A.发热

B.心肌炎

C.关节炎

D.血沉加快

E.X线关节面骨质损害

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属于脱位后期并发症的是()

A.血管损伤

B.骨折

C.神经损伤

D.关节僵硬

E.弹性固定

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