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
2025-01-14
12
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 onto 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’s 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 shuts 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.
Q. 23. What’s the purpose of the tank test?
Q. 24.Why is the tank test carried out under water?
Q. 25.Where is the second part test carried out?
Q. 26.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/3912670.html
相关试题推荐
[originaltext]Themosteffectivepeoplearethesamewhethertheyarchavinga
[originaltext]Themosteffectivepeoplearethesamewhethertheyarchavinga
[originaltext]Themosteffectivepeoplearethesamewhethertheyarchavinga
[originaltext]W:DidyougotothefootballmatchonSaturday?M:No,Ihadto
[originaltext]W:DidyougotothefootballmatchonSaturday?M:No,Ihadto
[originaltext]W:DidyougotothefootballmatchonSaturday?M:No,Ihadto
[originaltext]You’veprobablyheardtheslogan"savethewhales".Doyoukn
[originaltext]You’veprobablyheardtheslogan"savethewhales".Doyoukn
[originaltext]W:ProfessorPierson,couldyougiveusabriefintroductionoft
[originaltext]W:ProfessorPierson,couldyougiveusabriefintroductionoft
随机试题
【B2】[br]【B10】meannoharmmeannoharm为固定短语,意为“没有恶意”。
Thoughsmallinsize,Switzerlandhasfourofficiallanguages:German,Frenc
1.女士着装 化淡妆,不宜浓妆艳抹,这样不仅能凸显自我,也能表示出
(2019年真题)甲单位为一家中央级事业单位,内部控制事项如下: 2019年6
属于男性独有的浆膜腔()A.胸膜腔 B.腹膜腔 C.心包腔 D.
(2016年)下列系统需求选项中,属于GIS系统安全需求的是()。A
下列哪项手术无需术前预防性应用抗生素A.右肺切除术 B.胃大部切除术 C.甲
以下不是从众现象的有() A.入乡随俗B.足球赛后的骚乱 C.暴乱中跟大
影响人际关系的心理效应不包括()。A:成见效应B:近因效应C:从众效应D:
期货公司的风险监管报表被相关会计师事务所出具了保留意见、带强调事项段或其他事项段
最新回复
(
0
)