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
2024-04-20
28
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.(22)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.(23)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.(24) This doesn’t cause so much damage in side the water tank as it would anywhere else. Engineers can discover which part of the plane cracked. This part is made stronger.
(24)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.(25)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、In the air.
B、On the airfield.
C、Under water.
D、At plane manufacturing factory.
答案
A
解析
细节题。文中介绍了最危险的是第二步在空中进行的飞行测验。
转载请注明原文地址:https://tihaiku.com/zcyy/3563335.html
相关试题推荐
[originaltext]"CharlieGriffin’sBritishpigwasinmypotatoesagain!"bel
[originaltext]"CharlieGriffin’sBritishpigwasinmypotatoesagain!"bel
[originaltext]IntheUnitedStatestoday,therearetwomajorparties—theD
[originaltext]IntheUnitedStatestoday,therearetwomajorparties—theD
[originaltext]Theworldhasbecomenoisierplace,sayexpertsattheLibrar
[originaltext]W:Whatonearthhashappenedtoyou?Youlookabsolutelywornou
[originaltext]W:Whatonearthhashappenedtoyou?Youlookabsolutelywornou
[originaltext]W:Whatonearthhashappenedtoyou?Youlookabsolutelywornou
[originaltext]W:Willyoutakethesebookstothelibraryduringyourlunchhou
[originaltext]W:Willyoutakethesebookstothelibraryduringyourlunchhou
随机试题
Foryears,scientistshavebeenstudyinghowmusicaffectsthebrainandits
某办公楼全日循环管道直饮水系统的最高日直饮水量为2500L,小时变化系数为6,水
下列说法错误的是()。A.BIM的理论基础主要起源于建筑行业 B.BIM是对工
支气管哮喘病人不宜用下列哪种药物麻醉()A.地西泮 B.氯胺酮 C.依托
急性化脓性脑膜炎并发硬脑膜下积液时,以下哪项不符()A.常发生于经特效治
合成高分子防水卷材进场时必须检验的项目有()。A、可溶物含量 B、不透水性
下列货币政策中,属于间接信用指导的有:A、利率政策 B、道义劝告 C、
学习一种新材料时运用联想、假借意义,对记忆有帮助的这种方法称为( )。A.语义
自2004年1月1日起,对证券投资基金管理人运用基金买卖股票、债券的差价收入,继
流通国债是指可以在流通市场上交易的国债,它的特征是()。 A.自由转让B.
最新回复
(
0
)