问题 填空题

氢分压是加氢反应的重要操作参数之一。提高氢分压有利于加氢反应的进行,提高氢分压还有利于减少缩合和迭合反应的发生,并改善碳平衡向着有利于减少(减少积碳)方向进行,但是氢分压过高将导致烯烃的过度饱和,使汽油的()降低,一般要求反应器入口的氢分压为()

答案

参考答案:辛烷值、2.0—2.5Mpa

阅读理解

阅读理解。

     Rebecca Stevens was the first British woman to climb Mount Chomulongma. Before she went up the

  highest mountain in the world, she was a journalist and lived in a small flat in South London.

     In 1993, Rebecca left her job and fer family and traveled to Asia with some other climbers. She found

  that life on Chumolongma is hard. "You must carry everything on your back," she said, "so you can only

 take things that you will need. You can't wash on the mountain, and in the end I didn't even take a

 toothbrush. I am usually a clean person but there is no water, only snow. Water is very heavy so you only

  take enough to drink!"

     When Rebecca reached the top of the Mount Chumolongma on May 17,1993, it was the best moment

  of her life. Suddenly she became famous.

     Now she has written a book about the trip and people often ask her to talk about it. She has a new job

 too, on science program on television.

     Rebecca is well known today and she has more money, but she still lives in the little flat in South

 London among her pictures and books about mountains.

1. Rebecca was a _____ before she climbed Chumolongma.

    A. climber        

    B. scientist        

    C. journalist        

    D. writer

2. Rebecca came to Asia to  _____ .

    A. leave her family                  

    B. to leave her job

    C. find a new job                  

    D. climb the mountain

3. According to the passage, life hard on Chumolongma because  _____ .

    A. the mountain is too high            

    B. all the living things hard to carry

    C. she is usually a clean person        

    D. water there is too little to wash

4. After her trip to Asia, Rebecca  _____ .

    A. lived in the same flat              

    B. did the same job

    C. learned to take pictures            

    D. began to write books

5. Rebecca became famous because  _____ .

    A. her hard woman                  

    B. her pictures and books

    C. having so much money            

    D. reaching the top of the world

单项选择题