试题与答案

离心水泵叶轮的轴向推力产生的原因有哪些?

题型:问答题 简答题

题目:

离心水泵叶轮的轴向推力产生的原因有哪些?

答案:

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参考答案:双氧水

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短文改错。
     此题要求改正所给短文中的错误。对标有题号的每一行做出判断:
     如有错误(每行只有一个错误),则按下列情况改正:
     该行多一个词:把多余的词用斜线(\)划掉,在该行右边横线上写出该词,并也用斜线划掉。
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     该行错一个词:在错的词下划一横线,在该行右边横线上写出改正后的词。
     注意:原行没有错的不要改。
     Last Saturday evening, my friends and I went to a restaurant         
to attend my classmate Wang Lin’s birthday party. We bring him     
 many pretty gifts, and shared with a big birthday cake. Then we had  
dinner happy together. After that, we Sang songs and danced.        
All of us had a good time.                                           
     Nowadays, more and more student celebrate their birthdays         
in restaurants. There are different voices from people. So personally,
I think it’s OK. With a improvement of people’s living standard,
they can do things we like with our pocket money.               
     On the one hand, it’s good chance for us to communicate           
with each other, which Can increase Our friendship. On the another   
hand. we can also relax ourselves before a week’s hard work.     
What’s your opinion?                                                
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