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
23
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、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
主旨题。文章主要讲述了飞机在正式使用前进行的两次试验。在短文的最后也总结说这两次实验是测试飞机在载客之前的安全性能。
转载请注明原文地址:https://tihaiku.com/zcyy/2947072.html
相关试题推荐
Before1965manyscientistspicturedthecirculationoftheocean’swaterma
Before1965manyscientistspicturedthecirculationoftheocean’swaterma
Before1965manyscientistspicturedthecirculationoftheocean’swaterma
Before1965manyscientistspicturedthecirculationoftheocean’swaterma
Before1965manyscientistspicturedthecirculationoftheocean’swaterma
Before1965manyscientistspicturedthecirculationoftheocean’swaterma
Before1965manyscientistspicturedthecirculationoftheocean’swaterma
[originaltext]AmericanvisitorstoEasternAsiaareoftensurprisedandpuz
[originaltext]InBritainthebiggestnumberofworkingforeignerscomesfro
[originaltext]Thefamilyischanging.Inthepast,grandparents,parents,a
随机试题
BritainisseparatedfromtherestofEuropebytheEnglishChannelinthe_____
《笠泽从书》的作者是()A.皮日休 B.陆龟蒙 C.罗隐 D.杜牧
木结构房屋中梁的耐火极限不应低于()h。A.3.0 B.2.0 C.1.
右图是一个长方形花坛,阴影部分是草地,空地是四块同样的菱形,则草地与空地的面积之
属于脾胃虚弱妊娠恶阻的症状为A.妊娠初期,呕吐不食,或呕吐清涎 B.妊娠初
A.直肠给药亦不可能达到预期的吸收效果,对新生儿的治疗作用有限B.与局部组织或器
A.脑震荡 B.脑挫裂伤 C.颅底骨折 D.颅盖骨折 E.硬脑膜外血肿开
在城市社会中,()揭示了城市的内在结构。A.社会分层 B.社会隔离 C.
模拟信号采用数字传输时,假定模拟信号承载的是数字数据,采用下列哪种设备再生信号(
投资项目决策分析与评价的基本要求包括贯彻落实科学发展观、资料数据准确可靠和()
最新回复
(
0
)