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
60
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.
【C14】
选项
A、over
B、at
C、around
D、on
答案
B
解析
“the Max Plank Institute for Mental Research”是一个机构,具体地说,它是一个研究所。“在某个机构”可用at或in,at表示“机构”,in表示“方位”,是“三维”的。故选B。
转载请注明原文地址:https://kaotiyun.com/show/XILd777K
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
ScienceandTechnologyThereisadifferencebetweenscienceandtechnology.【B1】______Sciencehastodowithdiscoveringth
CulturalDifferencesPeoplefromdifferentculturessometimesdothingsthatmakeeachotheruncomfortable,sometimeswithou
CulturalDifferencesPeoplefromdifferentculturessometimesdothingsthatmakeeachotheruncomfortable,sometimeswithou
CulturalDifferencesPeoplefromdifferentculturessometimesdothingsthatmakeeachotheruncomfortable,sometimeswithou
AImportanceofstayingintellectuallyactiveBEffectsofagingonaperson’srecallabilityCShort-termmemoryversuslong
AImportanceofstayingintellectuallyactiveBEffectsofagingonaperson’srecallabilityCShort-termmemoryversuslong
InitiallythewriterdidnotwanttobuyahearingaidbecauseAccordingtothepassage,hearinglossis
TheboysoldgoodsfromdoortodoorbecauseButfortheyoungwoman’skinddeed,theboycould
InitiallythewriterdidnotwanttobuyahearingaidbecauseAccordingtothepassage,hearinglossis
随机试题
在Windows网络中,下列关于ICS和NAT的描述中错误的是()。
简述标准溶液的配制方法。
郭沫若的诗集包括《死水》《女神》《星空》和《恢复》等。()
A.乙型肝炎病毒B.丙型肝炎病毒C.丁型肝炎病毒D.戊型肝炎病毒E.庚型肝炎病毒只引起急性肝炎的肝炎病毒为
心理咨询的对象大多是
A.开胃健脾丸B.柏子养心丸C.十滴水D.川贝止咳露E.防风通圣丸孕妇慎用的中成药是()。
狂犬病的最常见的主要传播途径()。
()是指对纳税人的所得或利润课征税收的总称,包括个人所得税、公司所得税、社会保障税等。
下列关于培训与开发决策分析的表述错误的是()。
当事人约定以交付定金作为订立主合同担保的,实际交付的定金数额只能多于约定的数额()
最新回复
(
0
)