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
17
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
地方性砷中毒可出现()A.甲状腺肿大 B.牙齿釉面着色和缺损 C.皮肤色
造价低,运行管理方便,但没有后备供热能力的热力管网布置形式应是()。A.枝状管网
面肌收缩出现表情的主要原因是()A.起于颅骨 B.止于皮肤 C.止于
羚羊角切制常采用()。A.切B.锉C.镑D.刨E.碾
似曾相识的故事,只要你静心观察,就在我们生活周遭日复一日__地演出。人生旅途看起
下列选项中,对社会化的条件表述正确的有()。A:人有较长的生活依赖期B:人有
招标人可从()方面进行工程造价控制。A、设置最高投标限价B、变更中标合同价格
患儿,男,1岁,因急性扁桃体炎给予5%葡萄糖注射液250ml+清开灵注射液10m
女,51岁。右腹股沟下方包块3年。平卧后可变小,4小时前搬重物后,包块突然增大,
2014年6月10日,某施工企业委托某专利事务所申请发明专利。6月12日该专利事
最新回复
(
0
)