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
2016-07-17
20
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.
【C8】
选项
A、effected
B、beaten
C、slapped
D、affected
答案
D
解析
整个句子是说:均匀的物质不太好抵御敲打,因为受到影响的只有一小部分物质。…is actually affected“实际受到影响”。故选D。
转载请注明原文地址:https://kaotiyun.com/show/RILd777K
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
NaturalMedicinesSinceearliestdays,humanshaveusedsomekindsofmedicines.Weknowthisbecausehumanshavesurvived.
CulturalDifferencesPeoplefromdifferentculturessometimesdothingsthatmakeeachotheruncomfortable,sometimeswithou
CulturalDifferencesPeoplefromdifferentculturessometimesdothingsthatmakeeachotheruncomfortable,sometimeswithou
AImportanceofstayingintellectuallyactiveBEffectsofagingonaperson’srecallabilityCShort-termmemoryversuslong
InitiallythewriterdidnotwanttobuyahearingaidbecauseOnespecialfeatureofCrystalEaristhat
TheboysoldgoodsfromdoortodoorbecauseAmongotherthings,thestoryshowsthat
TheboysoldgoodsfromdoortodoorbecauseDr.Kellygavespecialattentiontothecasemainlybecause
TheGeneIndustryMajorcompaniesandalreadyinpursuitofcommercialapplicationsofthenewbiology.Theydreamofplacing
随机试题
某方法一次测量得出的结果很接近于真值,说明该方法
禁用于肾功能不全患者的抗菌药物是
企业发生会计估计变更时,下列各项中不需要在附注中披露的是()。
我国股票市场的场内市场包括()。Ⅰ.沪深主板市场Ⅱ.创业板市场Ⅲ.新三板市场Ⅳ.交易柜台市场
某公司因持续暴雨导致停工损失5天,停工期间发生的原材料损耗7000元,应分摊的人工费用3000元,应分摊的水电费500元,该停工损失应由保险公司赔偿2000元,假定不考虑其他因素,下列关于停工损失会计处理正确的是()。
根据劳动合同法律制度的规定,下列各项中,当事人不能享受2010年的年休假的是()。
请将新创建工作簿中工作表数目定义为5。
Whatsthemandoing?
FoodanddrinkplayamajorroleinChristmascelebrationsinmostcountries,butinfewmoresothaninMexico.Manyfamiliesov
Communicationstechnologiesarefarfromequalwhenitcomestoconveyingthetruth.Thefirststudytocomparehonestyacrossa
最新回复
(
0
)