问题 问答题

推土机在发动机起动以后,有哪些注意事项?

答案

参考答案:

(1)使发动机低速转动,若发动机机油压力指示表在10秒钟内不能指向正常范围内,查明原因,然后再起动,否则会导致发动机故障;

(2)在机油压力未达到规定值,发动机转速过高会损坏涡轮增压器;

(3)为使液压元件快速升温,循环使用工作装置各个操纵杆,使预热后的液压

油在各液压油缸和液压管路中循环流动;

(4)起动后让发动机在怠速下空转5~10分钟,待水温达55℃及制动低压报警蜂鸣器不再报警后再进行起步行驶;

(5)不能让发动机在空档位上高速运转或低速运转持续运行20分钟以上;

(6)如果有必要让发动机在空挡位运行,应不时施加一负载或让发动机置于中速运行。

阅读理解

阅读理解。

     One day a man went home and said to his wife, "I bought something for you." "Thank you!" said

his wife. "What have you bought for me?" "I've bought a gold ring (金戒指). Here it is." He took it

out for his wife to see. Then he dropped it to the ground. He began to look for it on the ground, but

it was dark in the house and he could not see anything. Then he went out and began to look for it in

the street. Just then a friend came along. "What's the matter with you?" asked his friend. "I am looking

for my ring. I lost it just now." said the man. "Where did you lose it?" "I lost it in my house." "You

lost your ring in your house, but you are looking for it in the street. How foolish it is!" "Ah," said the

man, "But it is dark in my house. I shall never find it there. Bet here in the street, it is much  brighter,

I can see everything."

1. The man bought a ring for his ________.

A. son      

B. wife          

C. mother        

D. daughter

2. He lost his ring ________.

A. in the street

B. in the house

C. at house

D. in the house

3. _______ the man was looking for the ring, his friend came up.

A. Before    

B. After        

C. When          

D. Because

4. Why did the man begin to look for the ring in the street?Because ________.

A.he lost it in the street

B.it was much brighter in the street

C.his friend came up

D.he wanted someone to help him

5. The friend thought the man was _________.

A. clever    

B. bright        

C. interesting    

D. foolish

问答题 简答题