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
2023-08-26
14
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
细节题。文中提到在水下进行水舱试验危险性更小。
转载请注明原文地址:https://www.tihaiku.com/zcyy/2958068.html
相关试题推荐
[originaltext]Disastermoviesoftenportraitcatastrophesthatdestroy,or
[originaltext]Disastermoviesoftenportraitcatastrophesthatdestroy,or
[originaltext]Here’sthebiographyofJohnMuir.ItisJohnMuir’sownwrit
[originaltext]Peoplewritetoaskmeifthere’scorrelationbetweenacademi
[originaltext]Peoplewritetoaskmeifthere’scorrelationbetweenacademi
[originaltext]Peoplewritetoaskmeifthere’scorrelationbetweenacademi
[originaltext]M:Kathy,chaostheoryseemstobeabranchofphysicsormathema
[originaltext]M:Kathy,chaostheoryseemstobeabranchofphysicsormathema
[originaltext]W:Oh,hello,John.Areyouusingyourdictatingmachinethismor
[originaltext]W:Oh,hello,John.Areyouusingyourdictatingmachinethismor
随机试题
Attheapartment,wefoundanunshaven,grey-hairedmansittinginashabby
[originaltext]TheNationalAssociationofCollegesandEmployerscollectsi
久病体弱、长期卧床、排痰无力的患者,护士可协助胸部叩击以排痰,下列叩击方法错误的
如果将β为1.15的股票增加到市场组合中,那么市场组合的风险( )。A.肯定将
以下与乙撑亚胺类抗肿瘤药物性质不相符的说法是A.是在脂肪氮芥的氮原子上以吸电子基
根据以下材料,回答下列问题。 ①此前有一些研究表明,把年轻小鼠的
下列不属于商业银行咨询顾问业务的是()。A.企业信用评级 B.投资理财顾问
A学校与甲公司招标投标纠纷案 A校新建了一所学生宿舍,需要购买桌椅等家具,便在
由于发包人的原因导致承包人自有的设备窝工,该窝工费应按照()计算。A.台班费
绝对不应期出现在动作电位的哪一时相A、峰电位 B、负后电位 C、正后电位
最新回复
(
0
)