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
2023-08-22
37
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、Two important tests of a new airliner because it is put into use.
B、How to carry out tank test in the water.
C、How pilots carry out the test flights.
D、How to make a safe passenger plane.
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2948291.html
相关试题推荐
[originaltext]Yourassignmentsthistermwillbetowritetwomajorresearc
[originaltext]Yourassignmentsthistermwillbetowritetwomajorresearc
[originaltext]Yourassignmentsthistermwillbetowritetwomajorresearc
[originaltext]Mostsingle-parentfamiliesresultwhenamarriageendsindi
[originaltext]Mostsingle-parentfamiliesresultwhenamarriageendsindi
[originaltext]W:Dr.Anderson,couldyoupleaseclarifytherequirementsforth
[originaltext]W:Dr.Anderson,couldyoupleaseclarifytherequirementsforth
[originaltext]W:Dr.Anderson,couldyoupleaseclarifytherequirementsforth
[originaltext]M:I’vejustbroughtyourladderback,Mrs.Fielding.Thanksfor
[originaltext]M:I’vejustbroughtyourladderback,Mrs.Fielding.Thanksfor
随机试题
下面你将听到的是一段有关旅游的讲话。旅游是一项集观光、娱乐、健身为一体的愉快而美好的活动。旅游业随着时代进步而不断进步。从20世纪中期起,现代旅游业在
PartyTimeAmericansplanparties【T1】______.Asinothercultures,many
Wethinkit,possible__________thelocalgovernmentwillbeabletosolvetheho
TheAbortionClinicShootings:Why?A)Asthenationheardwith
TheCoolestClubAround EverySunda
2012年1-4月,该市平均每天观看电影的观众超过10万人次的月份有几个?
A. B. C. D.
很久以前,在法国土豆被称为“鬼苹果”,农民们都不愿意引种。一位农学家想出一个方法
期货从业人员在向投资者提供服务前,应当()地告知投资者期货投资的特点以及在期货
选磨方法中,错误的有A.一般先磨改正中验的早接触区,不轻易磨改功能牙尖 B.侧
最新回复
(
0
)