问题 问答题 简答题

简述炉前油系统的流程?

答案

参考答案:

燃油泵房过来的油经过滤网、流量测量装置、燃油调节阀、进油关断阀、然后由两根母管分别从锅炉的前后墙自上而下布置,从母管上引出支路,分别经各自的油角阀(电磁阀)送到炉膛的各层油枪,再送到炉膛中去。在每个火嘴的中心风筒中配以额定流量为1.2吨的油枪,油枪采用简单机械雾化、压力调节的方式,在炉前油系统的进出口上均装有精密的流量测量装置。

单项选择题
阅读理解

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

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

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.

3. The regulations say that each bus may carry _____ passengers at most. [ ]

A. 20

B. 40

C. 60

D. 129

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