首页
登录
职称英语
[originaltext] Before a new airliner goes into service, every part of it is
[originaltext] Before a new airliner goes into service, every part of it is
游客
2024-04-21
40
管理
问题
Before a new airliner goes into service, every part of it is tested again and again. But there are two tests that are more important than all the others. One of them is very strange and the other is very dangerous.
The first of these is called the "tank test". A modern airliner must fly at very high altitudes. Air must be pumped into the plane so that the passengers can breathe. The metal structure of the plane has to be very strong for this reason. When the plane is filled with air, the air presses against the skin of the plane. The pressure on a small window, for example, is like a huge, giant foot that is trying to get out. If a small part of the plane were to crack, the plane would explode in the sky. This is what happened to the first Comets. In order to test the structure of the plane, it is lowered into a huge tank of water. Then it is filled with air. The pressure inside the plane is greater than it ever will be when it is in the air. Finally, there is an explosion. This doesn’t cause so much damage inside the water tank as it would anywhere else. Engineers can discover which part of the plane cracked. This part is made stronger.
The most dangerous test happens when the new plane goes through test flights in the air. The test pilot must find out exactly what happens when the engines are shut off suddenly. He takes the plane up very high. Then he shut the engines off. The plane begins to fall like a stone. It is the pilot’s job to find out how he can get control of the plane again. These two tests are examples of how planes are made safe before they ever carry passengers.
Questions 22 to 25 are based on the passage you have just heard.
22. What is the purpose of the tank test?
23. Why is the tank test carried under water?
24. Where is the second test carried out?
25. What does this speaker mainly talk about?
选项
A、Because the water pressure is greater than air pressure.
B、Because the first Comets crashed in the water.
C、Because there is less damage when the explosion takes place under water.
D、Because it is the only way available for engineers to find out which part has cracked.
答案
C
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3564553.html
相关试题推荐
[originaltext]Beforeanewairlinergoesintoservice,everypartofitis
[originaltext]Beforeanewairlinergoesintoservice,everypartofitis
[originaltext]Beforeanewairlinergoesintoservice,everypartofitis
[originaltext]Yearsagobeforetherewererefrigerators,anice-housewasa
[originaltext]Facialexpressionscarrymeaningthatisdeterminedbysituat
[originaltext]W:Hi,Jack,haveyoufinishedProfessorSmith’sassignment?M:T
[originaltext]W:Hi,Jack,haveyoufinishedProfessorSmith’sassignment?M:T
[originaltext]M:Hey,anyideaofwhattodothissummervacation?Theredoesn’
[originaltext]M:Hey,anyideaofwhattodothissummervacation?Theredoesn’
[originaltext]M:Hey,anyideaofwhattodothissummervacation?Theredoesn’
随机试题
在对流传热过程中随着流体黏度的增大,其对对流传热过程的影响的正确说法为( )。
1岁2个月男孩。高热,体温39~40℃,频咳、喘憋5天住院。查体:精神弱,面色苍
依据《实验室资质认定评审准则》要求,当实验室业务量较大无法完成时,可分包给符合要
关于基金的分类,以下说法错误的是()A.基金资产80%以上投资于货币市场工具的为
胃癌淋巴转移好发于A.左腋窝下淋巴结 B.左锁骨上淋巴结 C.脐周淋巴结
属于长期医嘱的是( )。A.地塞米松5mgivqd B.奎尼丁0.2g
A.(1,2) B.(1,0.5) C.(2,0.5) D.(2,1)
简述现代企业人力资源管理各个历史发展阶段的特点。
股息率可调整优先股票的股息率的调整一般随()的变化作调整。 A.公司经营状
下列属于外汇掉期和货币互换的区别的是()。A.外汇掉期一般为1年以内的交易,也
最新回复
(
0
)