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
外语
There are two main things that make aircraft engineering difficult: the need to make every component as reliable as possible and
There are two main things that make aircraft engineering difficult: the need to make every component as reliable as possible and
admin
2015-12-31
34
问题
There are two main things that make aircraft engineering difficult: the need to make every component as reliable as possible and the need to build everything as light as possible. The fact that an aeroplane is up in the air and cannot stop if anything goes wrong makes it perhaps a matter of life or death that its performance is absolutely dependable.
Given a certain power of engine, and consequently a certain fuel consumption, there is a practical limit to the total weight of aircraft that can be made to fly. Out of that weight as much as possible is wanted for fuel, radio navigational (航行的,航运的) instruments, passenger seats, or freight (货物) room, and, of course, the passengers or freight themselves. So the structure of the aircraft has to be as small and light as safety and efficiency will allow. The designer must calculate the normal load that each part will bear. This specialist is called the "stress man". He takes account of any unusual stress that may be put on the part as a precaution (预防, 预防措施) against errors in manufacture, accidental damage, etc.
The stress man’s calculations go to the designer of the part, and he must make it as strong as the stress man says is necessary. One or two samples are always tested to prove that they are as strong as the designer intended. Each separate part is tested, then a whole assembly—for example, a complete wing, and finally the whole aeroplane. When a new type of aeroplane is being made, normally only one of the first three made will be flown. Two will be destroyed on the ground in structural tests. The third one will be tested in the air.
The designer’s work is based on______.
选项
A、the ground tests
B、the stress man’s calculations
C、the flight tests
D、all of the above
答案
B
解析
本题是一道具体细节题。问设计师的工作要以什么为基础。文章第三段第一句话指出,压力师的计算结果送交部件设计师,设计师必须按照压力师所指出的必要受力强度设计部件。因此,本题的正确答案应是B“以压力师的计算结果为基础”。
转载请注明原文地址:https://kaotiyun.com/show/xmPO777K
0
在职攻硕英语联考
相关试题推荐
Afterpeoplehavelearnedthatmagnetsattractthings,centuriespassed______theytooknoteofthefactthatmagnetssometimesa
Man:I’mfrustrated.We’resupposedtodoourassignmentonthecomputer,butIhavedifficultygettingaccesstothecomputersi
Theabilitytodoseveralthingsatoncehasbecomeoneofthegreatmeasuresofself-worthfor21st-centuryAmericans.Itisc
Woman:Itseemsthatyouenjoydoingsomanythingsatthesametime.Man:It’snotthatIlikethat,butthatIhavetoomany
Shefindsitdifficultto______hercareerambitionwithherresponsibilitytoherfamily.
Itisdifficulttoimaginewhatlifewouldbelikewithoutmemory.Themeaningsofthousandsofeverydayperceptions,thebases【
随机试题
患者,女,72岁。患帕金森病5年。随诊中病人表示现在多以碎步、前冲动作行走,并对此感到害怕。病人进行行走训练时,护士应提醒病人避免
在宗地图中,标志“45360/450混3”的含义是指()。
根据《水利工程设计概(估)算编制规定》,现场经费包括()。
雨期填筑路堤时,路堤应分层填筑,每一层的表面应()。
小王从事报关工作半年后又考上了研究生,决定完成学业后重新从事报关工作。在上学前,对报关员证件应当如何处理?
商品流通渠道系统中的垂直渠道系统是指由制造商、批发商和零售商按照纵向一体化原则组成的一个统一联合体。下列系统形式中,不属于垂直系统形式的是()。
下图是在一台主机上用sniffer捕获的数据包。请根据图中信息回答下列问题。该主机使用的DNS服务器的域名是【16】,DNS服务器的IP地址是【17】。
下列关于动态联编的描述中,错误的是()。
Theauthorbelievesinthepassagethat______.Psychologistsstudythemeaningofcolorpreferencebecause______.
A、Annoyinganddislikable.B、Annoyingbutcommon.C、Commonandacceptable.D、Impolitebutcommon.D男士首先提出很多顾客大声要求付账这一现象,并表示了不满;女
最新回复
(
0
)