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
Less Is More It sounds all wrong—drilling holes in a piece of wood to make it more resistant to knocks. But it works because
Less Is More It sounds all wrong—drilling holes in a piece of wood to make it more resistant to knocks. But it works because
admin
2015-07-04
55
问题
Less Is More
It sounds all wrong—drilling holes in a piece of wood to make it more resistant to knocks. But it works because the energy from the blow gets distributed throughout the wood rather than focusing on one weak spot. The discovery should lead to more effective and lighter packaging materials.
Carpenters have known【C1】______centuries that some woods are tougher than others. Hickory, for example, was turned into axe handles and cartwheel spokes because it can absorb shocks without breaking. White oak, for example, is much more easily damaged, 【C2】______ it is almost as dense. Julian Vincent at Bathe University and his team were convinced the wood’s internal structure could explain the differences.
Many trees have tubular vessels that run【C3】______the trunk and carry water to the leaves. In oak they are large, and arranged in narrow bands, but in hickory they are smaller, and more evenly distributed. The researchers【C4】______this layout might distribute a blow’s energy throughout the wood, soaking up a bigger hit. To test the idea, they drilled holes 0. 65 millimetres across into a block of spruce, a wood with 【C5】______vessels, and found that 【C6】______withstood a harder knock.【C7】______when there were more than about 30 holes per square centimeter did the wood’s performance drop off.
A uniform substance doesn’t cope well with knocks because only a small proportion of the material is actually【C8】______. All the energy from the blow goes towards breaking the material in one or two places, but often the pieces left【C9】______are pristine(未经破坏的).
But instead of the energy being concentrated in one place, the holes provide many weak spots that all absorb energy as they break, says Vincent. "You are controlling the places【C10】______ the wood breaks, and it can then absorb more【C11】______, more safely. "
The researchers believe the principle could be applied to any material—【C12】______example , to manufacture lighter and more protective packaging. It could【C13】______be used in car bumpers, crash barriers and armor for military vehicles, says Ulrike Wegst, 【C14】______ the Max Plank Institute for Mental Research in Stuttgart. But she emphasizes that you’d 【C15】______to design the substance with the direction of force in mind. "The direction of loading is crucial, " she says.
【C15】
选项
A、necessity
B、must
C、need
D、had
答案
C
解析
“you’d”中的’d=would,后面应跟原形动词;must是情态动词,只有need符合题意,可以跟不定式短语(need也可以作情态动词,但此处不是)。故选C。
转载请注明原文地址:https://kaotiyun.com/show/IzLd777K
本试题收录于:
职称英语理工类B级题库职称英语分类
0
职称英语理工类B级
职称英语
相关试题推荐
EatingPotatoesGivesYourImmuneSystemaBoostEatingpotatoesisnotonlygoodforbowelhealth,butalsoforthewholei
AinyourbodyBwithoutwaterCbeforelongDforachangeEonabusydayFtoyourweightDehydrationmayoccurifthereis
Hisclaimsseemcredibletomanypeople.
StomachUlcerStomachulcersarethecauseofseverepainformanypeople.Doctorshavebeenabletohelplessenthepainof
ScienceandTechnologyThereisadifferencebetweenscienceandtechnology.【B1】______Sciencehastodowithdiscoveringth
ScienceandTechnologyThereisadifferencebetweenscienceandtechnology.【B1】______Sciencehastodowithdiscoveringth
CulturalDifferencesPeoplefromdifferentculturessometimesdothingsthatmakeeachotheruncomfortable,sometimeswithou
AImportanceofstayingintellectuallyactiveBEffectsofagingonaperson’srecallabilityCShort-termmemoryversuslong
DrugReactions--aMajorCauseofDeathAdversedrugreactionsmaycausethedeathsofover100,000UShospitalpatientseach
Itisadvisabletoseeadentistregularly.
随机试题
关于X线管的阳极特性,错误的是
气郁化火的寒热症状可见疟疾的寒热特征为
纪女士被诊断患有滴虫性阴道炎,门诊护士向纪女士讲解正确用药方法,下列各项中需特别强调的是
工程造价等于不含税工程造价加上()。
下列各项中,属于资本公积的是( )。
在中央银行的一般性货币政策工具中,与存款准备金政策相比,公开市场业务的优点之一是()。
小刘比较调皮,在老师和同学眼中是一个“坏孩子”。社会工作者在与其交流中发现,小刘也认为自己是坏孩子,经过交谈,小刘也很想成为好孩子。根据认知行为理论,社会工作者最适当的做法应当是()
按照耶克斯一多德森定律,在描述唤醒水平与绩效水平之间的关系时,必须说明()
Readthetextbelowabouttelevisionnetwork.Inmostofthelines(41-52)thereisoneextraword.Itiseithergrammaticallyi
1EarlyinlifeMarthaGrahamlearnedthat"movementneverlies."Whenshewasalittlegirl,herfatherwarnedhernevertolie
最新回复
(
0
)