问题 问答题 简答题

制动机为什么设降压凤缸?

答案

参考答案:

当列车制动管减压时,副风缸导人制动缸的风量不变时,制动缸有效容积越小,则压力越大;反之容积越大,则压力越小。在空车时可以利用降压风缸扩大制动缸的有效容积,从而降低制动缸的压力,并减小闸瓦压力。

阅读理解

Dear Sir,

I have to travel every day from Souk Road to the airport. Two buses travel along their route (路线): the number 49 and number 16. But by the time the number 16 bus reaches Souk Road it is always full, so I can’t get on it. I have to wait for the number 49, because sometimes there are empty seats on it.

The timetable says that there are buses from Souk Road to the airport every ten minutes. If this is so, why do I have to wait half an hour for a bus nearly every day?

The regulations say that if there are empty seats on a bus, the bus must stop at every stop where people are waiting. Why do the half-empty buses go straight past me when I am standing at the bus stop?

The regulations say that no bus may carry more than 40 seated passengers  and 20 standing passengers. Yesterday I was the first to get off the bus when it reached the airport. I counted the other passengers as they got off. There were 129 of them.

It is clear that our bus companies break the regulations and think little of their passengers. Can nothing be done to make your service  better?

Yours

Tired passenger

小题1:The writer has to take Bus No.49 because      .

A.it arrives on time

B.it is not always full

C.it travels faster

D.it has fewer seats on it小题2:How long does the writer usually have to wait for a bus?

A.Ten minutes.

B.One hour.

C.Half an hour.

D.Nearly a day.小题3:The regulations say that each bus may carry       passengers at most.

A.20

B.40

C.60

D.129小题4:From the passage we can see that      .

A.the bus service was poor

B.no buses except the No.49 bus passed Souk Road

C.no passengers took their buses

D.the writer was always the first to get on the bus

阅读理解

阅读理解。

      Most people say" yes" much more readily than" no".

     A friend is moving house this weekend and would like some

help,and you agree. But, what you really wanted was relaxing at

home for a couple of quiet days,or a roommate spends the whole

weekend playing video games and wants to borrow your homework

for"reference". But,you've just finished it after working hard for a

whole day.

     Many people say" yes" to this kind of requests. They tend not

to consider their own interests and feelings,and are often angry with

themselves afterwards. Saying" no" requires courage and considerable

practice. " Everyone wants to be liked. " says Gabriele Steinki,a

German psychologist. "Saying'no'risks losing the affection of the

person asking for the favor. Or even a job. "The result is that many

people say"yes"just for keeping the peace. But experts say this is

regrettable. Anyone should have the right to say" no". In fact, rejecting

a request can even help to stabilize a relationship because it

expresses real affection. But,for peop'le accustomed to agreeing every

request,it's very distressing to say" no".

     Most people believe that if they say" no" ,they'll lose the affection

of the person. But the affection is important to them. This way

of thinking can be replaced by this:"If he only likes me because I

always do what suits him,then the price of this affection is too high

in the long term. "

    When people say " no", Steinki advises giving the reasons

calmly until the person gets the message.

1. What does the second paragraph tell us?  

A. In fact people are usually selfish.

B. Sometimes people say " yes" when they really want to say no .

C. It's not suitable to ask others to help at weekends.

D. It's disgusting to borrow homework for reference.

2. Many people don't say" no" though they really want to because    

A. they dare not offend the asker

B. they are afraid of breaking the good relationship with the asker

C. they don't care about their own feeling

D. they are good-tempered

3. The underlined word" distressing" can be replaced by "____ ".   

A. comfortable                      

B. funny

C. unnecessary                    

D. uncomfortable

4. The best title for the passage would be _____.  

A. You Need Courage to Say "No"

B. Saying" No"Is More Important Than Saying" Yes"

C. Saying " No" Would Bring Benefits

D. The Art of Saying " No"