问题 问答题 简答题

已知某泵入口压力为0.04MPa,出口压力为1.6MPa,输送流量为36.7m/n(=900kg/m),求泵的有效功率是多少KW?

答案

参考答案:

Ne=△P×Q/3.60=15.9kw

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Dear Sir, 

     As a middle school teacher and a mother of two children, I think your article on children and TV is very

interesting. (1) However, my views on the subject are a bit difference from yours. For years, many writers

have criticized (批评) TV programmes. Often, they don't think about television as a positive learning tool. I

________(use) TV in my classroom for years, and it has helped make learning a much more interesting

experience for my young students.

     In my opinion, TV can be helpful to young students. When it is used in the right way, it can even speed

up the learning process. I use TV programmes to teach Geography, Science and even reading. My students'

higher test marks prove that this method is working. Both of my children love watching the TV programme

Sesame (芝麻) Street and they are now among the top students in their school. (2) These types of programmes

help students learn basic language skills like the alphabet, and how to counting. They can also teach children

things like sharing,________ (protect) environment and caring about others. I think it's time to stop criticizing

TV, and focus on its amazing use for learning.

1. 用所给词的适当形式填空。

    (1)____________ (2)____________

2. 文中(1),(2)处各有一个错误,找出并改正。

    (1)____________ (2)____________

3. 将文中画线句子翻译成中文。

    ______________________________________________________

4. 判断正误(T)or(F)。

    ( ) The writer thinks that it is a good way to use TV for teaching.

5. Why does the writer think it is working to use TV programmes in class? 

    ______________________________________________________

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