首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
专升本
Before a new airliner goes into service, every part of it is tested again and again. But there are two tests that are more impor
Before a new airliner goes into service, every part of it is tested again and again. But there are two tests that are more impor
admin
2019-05-23
24
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, or"pressured" , the air presses against the skin of the plane inside. 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 does not cause so much damage inside the water tank as it would anywhere else. Engineers can discover which part of the plane has cracked. This part is made stronger.
The most dangerous test happens when the new plane is going through test flight in the air. The test pilot must find out exactly what happens when all the engines are shut off at once. 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.
The passage implies that modern airliners are______.
选项
A、reliable
B、dangerous
C、complicated
D、efficient
答案
A
解析
本文主要讲述了现代飞行器在投入使用之前的两次严格的检测,来表明现在的飞机是很安全可靠的,B、C两项叙述太片面,D项文中未提及。
转载请注明原文地址:https://kaotiyun.com/show/MbDC777K
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
相关试题推荐
Whilestillinitsearlystages,welfarereformhasalreadybeenjudgedagreatsuccessinmanystates—atleastingettingpeo
Agriculturewasastepinhumanprogress_______whichsubsequentlytherewasnotanythingcomparableuntilourownmachineage.
A.Theresultofthisprogressisanenormouspopulationincreasethatthreatensthequalityoflife,broughtaboutbyprogress
A、Theyusuallydon’tfollowfamilyrules.B、Theydon’tliketotakechancesintheirlives.C、Theyarelesslikelytobesuccess
Lifeasawomaninthecolonial(殖民的)Americaseemsquitedifferentfromitistoday.Womenwereconsideredinferiortomen,a
Ashiploadedwithexpensivegoodswasreported______intotheseawithitsoil______.
Duringtheperiodofeconomicdepressionmanycompanieshadto______someemployees.
BaekelandandHartmannreportthatthe"shortsleepers"hadbeenmoreorlessaverageintheirsleepneedsuntilthemenwerein
ThereAareallBkindsofCtheflowersandtreesDaroundtheclassroombuildings.
Thebuilding______mostlyundamagedaftertheearthquake,andonlyminorrepairswerenecessary.
随机试题
下列不属于睾酮生理作用的是()
哪种不是经阴道输卵管结扎术的禁忌证
下列选项属于休克晚期临床表现的是
患者,男性,30岁,溃疡性结肠炎,住院治疗。患者闷闷不乐,少与护士交流,特别希望家人常来探望。此需要属于
招标工程的标底可由开发商请有资格的概预算人员编制,亦可委托有营业执照的招标代理机构代编,是在招标文件编制完成后进行。()
散发有害气体的实验室及其相邻的办公室,其通风系统的设计,正确的是()。
税法的特点体现在许多方面,从立法过程来看,税法属于()。
即使某些错报低于财务报表整体的重要性,但因与这些错报相关的某些情况,在将其单独或连同在审计过程中累积的其他错报一并考虑时,注册会计师也可能将这些错报评价为重大错报。可能影响评价的情况有()。
阅读以下说明,回答问题1至问题4,将解答填入答题纸对应的解答栏内。【说明】如图3.1所示,某公司规划了两个网段,网段10.1.1.0/24为固定办公终端,网段10.1.2.0/24提供访客临时接入网络。PC-1使用固定IP地址:10.1.1.1
Thepopulationofourcityislargerthan______oftheirs.
最新回复
(
0
)