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
2023-08-18
51
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.(12)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.(13)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.(14)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.
(14)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.(15)These two tests are examples of how planes are made safe before they ever carry passengers.
Questions 12 to 15 are based on the passage you have just heard.
12. What is the purpose of the tank test?
13. Why is the tank test carried under water?
14. Where is the second test carried out?
15. What does this speaker mainly talk about?
选项
A、To find out how much air can be pumped into a plane.
B、To find out how much air passengers need to breathe at certain altitudes.
C、To find what would happen if the plane crashed in the water.
D、To find out if there are any weak parts in the plane that would burst under pressure.
答案
D
解析
细节题。文章谈到了减压水舱试验(tank test)是为了帮助工程师发现飞机的裂缝,以防飞机在飞行过程中由于压力过大而爆炸。
转载请注明原文地址:https://tihaiku.com/zcyy/2936376.html
相关试题推荐
[originaltext]Ifyou’recarefulenough,you’llfindthatitiscommonnowad
[originaltext]Ifyou’recarefulenough,you’llfindthatitiscommonnowad
[originaltext]Ifyou’recarefulenough,you’llfindthatitiscommonnowad
[originaltext]OneofNewYork’smostbeautifulandvaluablebuildingsisin
[originaltext]OneofNewYork’smostbeautifulandvaluablebuildingsisin
[originaltext]Ababyspendsthefirstyearoflifelearningtolisten.(9)A
[originaltext]Ababyspendsthefirstyearoflifelearningtolisten.(9)A
[originaltext]Ababyspendsthefirstyearoflifelearningtolisten.(9)A
[originaltext]W:Hi,Scott,haveyouheardaboutDianarecently?M:No,Ihave
[originaltext]W:Hi,Scott,haveyouheardaboutDianarecently?M:No,Ihave
随机试题
A、Thirty.B、Forty-eight.C、Seven.D、Thirteen.C计算题。听短文时,对选项的数字要做好标记。美国平均一天有一人死于雷
在组织的基本结构中,基本层次包括()。A.管理层 B.决策层 C.服务层
局部振动病的主要致病因素是()A.接触振动时间 B.低气温 C.振动频率
某大型零售公司的内部审计师怀疑,公司旗下销售商品成本很高的3家商店都有存货舞弊行
粗集料压碎值试验,应将试样分3次(每次数量大体相同)均匀装入试模中,每次均将试样
可引起新生儿胆红素脑病的药物是A.氨苄西林 B.葡萄糖酸钙 C.红霉素 D
表2018年全国及京津沪各类型外资企业进出口贸易额及同比增速 京津
某企业大批量,单一生产某种产品,该企业为了编制年度生产计划和季度生产计划,进行生
根据凯尔曼的观点,态度形成包括()等阶段。A.内化 B.评价 C.服从
职业病是劳动者在职业活动中因接触粉尘,放射性物质和其他有毒有害物质引起的疾病。《
最新回复
(
0
)