问题 问答题 简答题

作用阀的缓解位作用如何?

答案

参考答案:

当单独作用管或分配阀作用风缸管通大气时,使作用膜板下方的压力空气通大气,则作用膜板连同空心阀杆在缓解弹簧的推动下而处于下端位置。此时空心阀杆离开供气阀,使制动管通过空心阀杆通大气,机车呈缓解状态.

选择题

Felix, a little mouse, looked outside through the window of a farmhouse. Still nobody came. Maybe today, he thought hopefully. It was only a few days before Christmas and he was watching for a miracle(奇迹).

This farmhouse had been empty too long. It needed a family. Felix’s stomach made a noise. He realized that he had eaten nothing since yesterday. He took a bag from his home, and went next door to Farmer Mike’s.

Farmer Mike’s house had been a great place for Felix until the farmer married a wife who had a cat. Felix felt scared when he thought of it. He looked around cautiously as he moved quietly into the room and was quite nervous when he filled his bag with rice. He was turning to leave when suddenly he felt something unusual. The cat? Without thinking he started to run and luckily escaped the cat’s paws(爪子).

The next afternoon Felix heard some good news: a new family would move into the farmhouse soon. Felix was happy and hoped that the family would come before Christmas. Before long, a car came up to the house, with sandwiches, cheese and chocolate.

Felix’s Christmas miracle did arrive!

The house came alive the next few days. Felix enjoyed every hour of them. However, the day before Christmas when he was drinking hot chocolate with a big smile, he heard about the gift that the children of the family might get for Christmas. What? A cat? The smile froze(冻结)on his face; his mouth fell wide open. After a long moment, he at last found his voice: “Hey! Whose Christmas miracle is this?”

小题1:What does the underlined word “cautiously” mean in the passage?

A.平稳地

B.兴奋地

C.谨慎地

D.可怕地小题2:What’s the correct order of the following sentences?

a. Felix escaped from the cat.

b. Felix went into Farmer Mike’s room.

c. Felix enjoyed his life after the new family moved in.

d. Felix filled a bag with rice.

e. Felix heard about the gift that the children might get.

A.b-d-a-c-e

B.b-d-c-e-a

C.a-b-c-e-d

D.a-b-c-d-e小题3:How did the little mouse feel at the end of the story?

A.Excited.

B.Hopeful.

C.Angry.

D.Upset.小题4:Which of the following sayings can express the main idea of the story?

A.Love me, love my dog.

B.Where there is a will, there is a way.

C.Life is one trouble after another.

D.It is better to be poor than to be dishonest.

选择题