填料压得太紧会造成离心泵转子不动，下列排除方法中正确的是（）。 A.应松开填料压盖

发布时间：2021-01-09 22:53 │ 来源：www.tikuol.com

题型：单项选择题

问题：

填料压得太紧会造成离心泵转子不动，下列排除方法中正确的是（）。

A.应松开填料压盖

B.应取出填料，再慢慢上紧压盖

C.应松开填料压盖，再慢慢上紧

D.应取出填料环，再慢慢上紧

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阅读理解。

George Stephenson was born in 1781 in a poor family. He had to start work when he was only eight.
When George was fourteen, he became his father's helper. He spent a lot of time learning about engines
(发动机). And on holidays he often made one engine to pieces and studied each piece carefully. Soon he
became a very good worker though he could not read or write. He began to learn English letters when he
was seventeen years old. Every day after he did twelve hours of hard work,he walked a long way to have
lessons from a young school teacher. On his eighteenth birthday, he wrote his own name for the first time
in his life. George invented (发明) many things in his life. The train was the greatest one among them.
Today when we take trains from one place to another, we'll think of this great man-George Stephenson.

1. In which year did George Stephenson start to help his father? ______.

A. In 1781
B. In 1789
C. In 1795
D. In 1798

2. He learned about the engine ______.

A. through reading and writing
B. by making it to pieces and studying each piece carefully
C. at lessons from a young teacher
D. by asking a lot of questions

3. He spent a lot of time learning about engines and soon he became ______.

A. a great man
B. a good maker
C. a good worker
D. a good student

4. George Stephenson invented the ______.

A. the train
B. the telephone
C. the car
D. the computer

5. From the passage we know George Stephenson was one of the greatest ______ in the world.

A. workers
B. writers
C. learners
D. inventors

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A、23°26′

B、66°34′

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