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
27
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、In the air.
B、On the airfield.
C、Under water.
D、At plane manufacturing factory.
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2948290.html
相关试题推荐
[originaltext]TUVALU,atinycountryinthePacificOcean,hasaskedforhe
[originaltext]E-booksarebringingaboutaprofoundrevolutioninthewayb
[originaltext]AmericanmagicianDavidBlaineistobesuspendedinaglass
[originaltext]AmericanmagicianDavidBlaineistobesuspendedinaglass
[originaltext]W:Honey,couldyoucomehereforasecond.Weneedtotalk.Myp
[originaltext]W:Honey,couldyoucomehereforasecond.Weneedtotalk.Myp
[originaltext]W:Honey,couldyoucomehereforasecond.Weneedtotalk.Myp
[originaltext]W:Iwasworkingonapaperaboutthedifferencesbetweenwomena
[originaltext]W:Wow,youmusthavehad5hamburgersalready.Andthefootball
[originaltext]W:Wow,youmusthavehad5hamburgersalready.Andthefootball
随机试题
Itisimperativethathe______homeimmediately.A、shouldreturnB、oughttoretu
TextbooksintheU.S.aresoexpensivethatevenusedversionscangivestud
Thecommongardenpea,alsocalledtheEnglishpea,______foritsedibleseeds.
47/83×83÷47/83×83=A.1 B.83 C.2209
某高速路段管理处决定招聘10名道路辅助管理人员,以解决正式管理人员不足的问题,但
某场地有一正方形土坑,边长20m,坑深5.0m,坑壁直立。现从周边取土进行回填,
下列句子中,标点符号使用正确的一句是()。A.我们班的同学来自全国各地,有山东、
女,35岁,体重50kg,汽油火焰烧伤,Ⅱ度烧伤面积73%,第一个24小时补液总
工程监理单位的主要安全责任有()。A.采取措施保护施工现场毗邻区域内地下管线
成本类科目归属于()。A、费用要素 B、利润要素 C、收入要素 D、所有者
最新回复
(
0
)