问题 问答题 简答题

怎样防止燃气轮机贫油?

答案

参考答案:

避免贫油的措施:让空气沿火焰管上所开的孔分股进入火焰管。

一小部分空气(一次空气)经旋流器和火焰管头部前面的两排小孔及主燃孔进入火焰管。一次空气与燃料混合燃烧后,可达到很高的温度。由于温度高,燃料化学反应很激烈,使燃烧过程在火焰管头部附近的燃烧区内基本完成。

大部分空气(二次空气)沿火焰管后段的射流孔进入火焰管,与高温燃气掺混而降低燃气温度,达到涡轮所要求的温度。

阅读理解

Martin had just finished high school. He would go to college at the far end of the city. He didn’t want to live there, and he didn’t want to take the bus either. So his father agreed to buy him a car.

His father spent all his summer teaching him how to drive, from the ABC to the XYZ. Thinking of the great feeling of driving a new car, Martin learned very quickly, and received his driver’s license just before his eighteenth birthday.

The second day, all the family, and their dog, went to a car shop. Martin spent almost all the morning going from one car to another. Finally he saw a red Blue Bird. He had a test drive on the open ground, and called out, “This is what I want, Dad!” When everything was done, they were ready to leave.

Martin climbed into the front seat. He said excitedly, “It’s my first day driving alone. Dad, Mom, and Poo! Enjoy it!”

His dad immediately took the back seat, right behind the new driver. Martin wondered why his father chose that seat, for his father always enjoyed looking in front.

So he said, smiling, “I’m sure you’re back there to have a change after all those weeks of sitting in the front seat teaching me how to drive.”

“No,” Dad replied, “Do you remember what you did to me all those years when I took you to and from school? I am sitting here to hit and kick the back of your seat all the way!”

小题1:Which of the following is NOT the reason why Martin’s father agreed to buy him a car?.

A.Martin would go to college and it was far from home.

B.Martin preferred living at home to living at college.

C.Martin didn’t want to take the public transport.

D.Martin was able to learn how to drive very quickly.小题2:In which order did Martin do the following things?

a. He finished his high school.               b. He test-drove driving the new car.

c. He got his driver’s license.            d. He decided to buy the Blue Bird.

e. He kicked the front seat while his father was driving.

A.e—a—c—b—d

B.a—c—b—d—e

C.e—c—a—b—d

D.a—c—d—b—e小题3:How would the whole family probably feel on their way back home?

A.Angry

B.Sad

C.Cheerful

D.Shocked

问答题 简答题