问题 问答题 简答题

试述C210型磁电机向发动机上的安装方法?

答案

参考答案:

(1)中立位置控制阀处于中立位置时,同时油封垫圈也将进油缺口与进油室隔开。此时,排油室与回油室都被封闭。液压油泵空转,液压油缸内的油液既不增加也不减少,农具保持原来的位置上。

(2)进油位置(农具提升)当控制阀自中立位置前移1.5mm以后,控制阀的进油缺口开始与进油室相通,油液从后桥壳体内经滤清器,通过进油缺口进入进油室。液压油泵开始泵油,高压油经过高压油管进入液压油缸;推动活塞移动,通过悬挂机构来提升农具。

(3)快速回油位置(农具快降)当控制阀自中立位置后移到阀上的限位挡环与中间油封垫圈相碰的极限位置时,控制阀前端的四个回油缺口全部与回油室相通,液压油缸内油液在农具重量作用下,从控制阀四个回油缺口快速流回后桥壳体,农具便快速下降。

(4)慢速回油位置(农具慢降)当控制阀从快速回油位置前移5—6mm,控制阀上两个短宽回油缺口与回油室隔开,两个窄而长回油缺口仅有一小部分与回油室相通,液压油缸内的油液在农具重量作用下,因流通截面小,只能以细小流束流回后桥壳,农具便缓慢下降。快、慢速回油是两个区域,快中有慢,慢中有快,是“无极”变速,可根据作业的需要来进行选择。

阅读理解

阅读理解。

     We have all experienced days when everything goes wrong. A day may begin well enough, but

suddenly everything seems to get out of control. It seems as if a single unimportant event may cause a

number of things to happen. Let us suppose that you are preparing a meal and keeping an eye on the

baby at the same time. The telephone rings and this means your troubles are beginning. While you are

on the phone, the baby pulls the table-cloth off the table, destroying your half prepared meal. You hang

up hurriedly and attend to your baby. Meanwhile, the meal gets burnt. As if this were not enough to bring

you to tears, your husband arrives, unexpectedly bringing three guests to dinner.

     Things can go wrong on a number of people on the road. During the rush hour one evening two cars

hit each other and both drivers began to argue. The woman driver behind the two cars happened to be a

learner. She suddenly go into a panic (恐慌) and stopped her car. This made the driver following her

stop suddenly. His wife was sitting beside him holding a large cake. As she was thrown forward, the

cake went right through the window and landed on the road. Seeing a cake flying through the air, a

truck-driver had to stop his truck all of a sudden. The truck was carrying empty beer bottles and

hundreds of them slid off the back of the truck on to the road. This led to yet another angry argument.

Meanwhile, the traffic piled up behind. It took the police nearly an hour to get the traffic on the move

again. In the meanwhile, the truck-driver had to sweep up hundreds of broken bottles. Only two dogs

were enjoying themselves from the accident, for they were happily having what was left of the cake. It

was just one of those days!

1. According to the author's opinion, ____.

A. a small matter may cause great trouble

B. accidents may happen anytime

C. troubles always come in groups

D. anyone may have trouble any day

2. When the telephone rings,____.

A. you'd better have your baby a little distant from your table before answering it

B. your trouble is sure to come

C. you'd better just let it ring all the way

D. you should never go to answer it in a hurry

3. What did the police do after the accident?

A. They helped the driver clean up the road.

B. They helped the drivers to go on with their journey.

C. They tried to stop the people from arguing.

D. They would find out who should be responsible

4. From the story we can see ____.

A. such accidents are rather common

B. such accidents are rather strange

C. no one can explain why such accidents happen

D. some drivers are too careless

阅读理解

阅读理解

     Happiness is for everyone. You don't need to care about those people who have beautiful houses

with large gardens and swimming pools or those who have nice cars and a lot of money and so on.

Why? Because those who have big houses may often feel lonely and those who have cars may want to

walk on the country roads in their free time.

     In fact, happiness is always around you if you put your heart into it. When you are in trouble at

school, your friends will help you; when you study hard at your lessons, your parents are always taking

good care of your life and your health; when you get a success, your friends will say congratulations to

you; when you do something wrong, people around you will help you to correct it. And when you do

something good to others, you will feel happy, too. All these are your happiness. If you notice a bit of

them, you can see that happiness is always around you.

      Happiness doesn't mean money. It is a feeling of your heart. When you are poor, you can also say

you are very happy, because you have something that can't be bought with money. When you meet with

difficulties, you can say loudly you are very happy, because you have more chances to challenge yourself. As the saying goes, life is like a revolving(旋转的)door. When it closes, it also opens. If you take every

chance you get, you can be a happy and lucky person.

1. When you do something wrong , people around you will     .

A. quarrel with you              

B. help you correct it

C. do something wrong like you    

D. laugh at you

2. What will your friends say when you make great progress?

A. Oh, so do I                  

B. Congratulations!

C. Good luck!                    

D. Just so-so

3. The passage mainly tells us      .

A. parents always care for our life and health

B. we're not happy if we meet with difficulties

C. happiness is always around us

D. life is colorful