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
Do you realize that every time you take a step, the bones in your hip are subjected to forces between four and five times your b
Do you realize that every time you take a step, the bones in your hip are subjected to forces between four and five times your b
admin
2010-01-16
29
问题
Do you realize that every time you take a step, the bones in your hip are subjected to forces between four and five times your body weight? When you are running, this force is increased further still. What happens if through disease a hip-joint ceases to be able to resist such forces? For many years hip-joints and other body joints have been replaceable either partially or completely. It is after all a simple ball and socket joint; it has certain loads imposed on it; it needs reliability over a defined life; it must contain materials suitable for the working environment. Any engineer will recognize these as characteristic of a typical engineering problem, which doctors and engineers have worked together to solve, in order to bring a fresh lease of life to people who would otherwise be disabled.
This typifies the way in which engineers work to help people and create a better quality of life. The fact that this country has the most efficient agricultural industry in the world is another good example. Mechanical engineers have worked with farmers and biologists to produce fertilizers, machinery and harvesting systems. This team effort has now produced crops uniformly waist high or less so that they are better suited to mechanical harvesting. Similar advances with other crops have released people from hard and boring jobs for more creative work, whilst machines harvest crops more efficiently with less waste. Providing more food for the rapidly increasing population is yet another role for the mechanical engineer.
选项
A、When one is walking.
B、When one is running.
C、When one is standing.
D、When one is lying down.
答案
B
解析
本文用生活中的例子介绍工程师,尤其是机械工程师,在医学和农业方面的作用,表明工程师的工作对改善人们的生活所作的巨大贡献。
第一小题为细节题。依据开头两句。人迈步时,骨关节要承受人的体重四到五倍的压力。跑步时,这种压力增大。躺着、站着、行走、跑动四种状态骨关节承受的压力递增。
转载请注明原文地址:https://jikaoti.com/ti/bGbMFFFM
0
专业英语四级
相关试题推荐
MostofushaveanimageofastandardEnglishinpronunciation,andverycommonlyinGreatBritainthisis"ReceivedPronun
CommunicatingwithStrangersI.Theconceptofthestrangerandthedefinitionofstrangeness:A.Strangenessandfamiliarity
Belowaretwoexcerptsonanimportantconcernofmusicindustry:whetheritiscorrecttosharemusicwithoutpayingornot.
PassageTwo(1)Why,despitethecoronaviruspandemic,housepricescontinuetorise?(2)Duringtheglobalrecession
PassageThree(1)InaninterviewneartheendofhiscareerthefashiondesignerYvesSaintLaurentconfessedtoaregret:
PassageThreeWhatistheauthor’spurposeofquotingthewordsofFranThorns?
Earlyanthropologists,followingthetheorythatwordsdeterminethought,believedthatlanguageanditsstructurewereentirel
MillionsofAmericansruntothebankorvisitautomatedtellermachineswhentheyneedcash.Theyusecreditcardswhentheywa
IamquitesurethatIcan________Michaelintolettingususehiscartomorrow.
Whenwegotthere,whatwereleftbehind______emptybottles.
随机试题
下面指标中,根据其计算方法,理论上所给出买、卖信号最可靠的是()
能治疗白癜风的药为
男性患者,56岁,反复咳嗽、咳脓痰、间断发热5年,糖尿病病史10年。胸部X线片提示右肺下厚壁空洞,内有液平,周围纤维组织增生。欲鉴别诊断慢性纤维空洞型肺结核与慢性肺脓肿,下列哪项检查最必要
2005年试题【试题要求】1.任务说明下图为某多层公共建筑的局部立面(见图2.3一19、图2.3一20),其外饰面为干挂30mm厚花岗石板,要求按提供的配件及材料绘制指定节点的构造详图(在图2.3一21~图2.3一23上作答)。2.构造要
我国发展社会主义科学和文化艺术事业的基本方针是()。
“一两遗传胜过一吨教育”是个体身心发展的()的观点。
骨骼对于()相当于()对于房屋
(2013下集管)在进行项目整体变更控制过程中,首先要受理变更申请,接下来______。
W:Howdoesyourdaughterlikehernewschool?M:______
InancientGreeceathleticfestivalswereveryimportantandhadstrongreligionsassociations.TheOlympianathleticfestivalh
最新回复
(
0
)