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预塔塔底无液面是何原因？应如何处理？

答案

参考答案：

原因有四：（1）入料少（2）采出量大（3）蒸汽量大（4）液位计指示失灵。

处理方法：（1）增加入料量（2）减少采出量（3）减少蒸汽量（4）检修液位计。

阅读理解


Spring is coming . The flowers will start blossoming (开花)and the trees will be filled with colors. It’s time of the year for people to plant trees. Planting trees is a good way to protect our environment. But most of us don’t have a place to plant trees. So what can we do for protecting the environment? We can make a difference from the others. For example, we can think about a way to make people cut down fewer trees. As we know, paper is made from trees. If we use less paper, we can save a lot of trees. Then we may have a problem that how to use less paper. Let me tell you my ideas.                                                   
Reducing Our Paper Waste
Every day we just use the paper and we don’t think about where the paper comes from.Let us think about wasting a piece of paper is like wasting a tree. We can start with reducing the amount of paper products that we use. This could be done by such a simple way as using e-mail instead of writing notes.
Reusing

We could reuse paper that is clean on one side for drafts, notes and even photocopies. As students, we could reuse paper by doing our research online or at libraries rather than buying lots of written paper. Sharing books or buying a used textbook for school is another way of reusing.
Recycle
We should consider recycling notebook paper, newspapers, magazines and colored paper. We can buy paper towels, tissues, and toilet paper that have been made from recycled paper. Don’t throw away the wasted newspapers or books which are not useful to you.
       
小题1:People can protect the environment by doing the following things except ______.
A．planting treesB．reusing paper
C．drinking less waterD．cutting down less trees
小题2:We can reduce our paper waste by______.
A．sending e-mailB．writing lettersC．sending cardsD．using paper bag
小题3:______isn’t a way for you to reuse paper.
A．Doing research onlineB．Buying lots of written paper
C．Sharing booksD．Buying a used textbook
小题4:______can be recycled to make paper towels, tissues and toilet paper.
A．Colored paperB．Newspapers
C．MagazinesD．All of the above
小题5:From the passage we know that      .
A．we can reuse paper for drafts, notes and even photocopies
B．the paper is made from clothes and trees
C．four ideas are mentioned here to save paper.
D．we should cut down more trees to make more paper
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选择题

She ________ his number in the phone book to make sure that she had got it right.

A．looked up

B．looked for

C．picked put

D．picked up
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