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
65
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.
【C4】
选项
A、discovered
B、concluded
C、found
D、thought
答案
D
解析
紧跟其后的句子是这样说的:To test the idea…(为了验证这一想法)。这个提示告诉我们空格所在句子的动词后面的命题是研究人员的想法而不是事实。因此须用thought。discovered和found是事实性动词,与后一句话矛盾。
转载请注明原文地址:https://kaotiyun.com/show/GzLd777K
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
DangersAwaitBabieswithAltitudeWomenwholiveintheworld’shighestcommunitiestendtogivebirthtounderweightbabie
CollegeNightOwlsHaveLowerGradesCollegestudentswhoaremorningpeopletendtogetbettergradesthanthosewhoareni
ScienceandTechnologyThereisadifferencebetweenscienceandtechnology.【B1】______Sciencehastodowithdiscoveringth
CulturalDifferencesPeoplefromdifferentculturessometimesdothingsthatmakeeachotheruncomfortable,sometimeswithou
CulturalDifferencesPeoplefromdifferentculturessometimesdothingsthatmakeeachotheruncomfortable,sometimeswithou
CulturalDifferencesPeoplefromdifferentculturessometimesdothingsthatmakeeachotheruncomfortable,sometimeswithou
SeekHealthandWellness1Whetheryouarebusystudyingorstartingclerkship,itisabsolutelyessentialtomaintainhealthand
InitiallythewriterdidnotwanttobuyahearingaidbecauseAccordingtothepassage,hearinglossis
Inordertoimproveourstandardofliving,wehavetoaccelerateproduction.
随机试题
将原材料或半成品转变成产品的方法和过程,称为________。
健康保险中不包括
男,35岁。消瘦、乏力、怕热、手颤二个月,夜间突然出现双下肢软瘫,急诊查:神志清,血压140/80mmHg,心率108次/分,律齐,甲状腺轻度增大、无血管杂音。此病人的急诊处理应
某地区抗震设防烈度为7度(0.15g),场地类别为Ⅱ类,拟建造一座4层商场,商场总建筑面积16000m2,房屋高度为21m,采用钢筋混凝土框架结构,框架的最大跨度12m,不设缝。混凝土强度等级为C40,均采用HRB400钢筋。试问,此框架角柱构造要求的纵向
某高速公路段工程长度12km,路基宽度30m,结构工程为六车道,道路结构为:细粒式沥青面层+中粒式沥青混凝土上基层+粗粒式沥青混凝土中基层+粉煤灰三渣下基层+粒料垫层。公路段所处位置地势平坦低洼,高程在3.1~3.6m,周围河流密布。本工程沿线可分为2个地
观众:电视:新闻
用差别阈限法制作等距量表所画出的心理物理关系图,其横坐标和纵坐标分别是()
[*]
打开考生文件夹下的演示文稿yswg.pptx,按照下列要求完成对此文稿的修饰并保存。第一张幻灯片的背景设置为“水滴”纹理,且隐藏背景图形;全文幻灯片切换方案设置为“棋盘”,效果选项为“自顶部”。放映方式为“观众自行浏览”。
A、Peopleshouldn’tgetusedtousingtheInternet.B、Internetishelpfuldespiteitsdisadvantage.C、Internetbringsmoregoodn
最新回复
(
0
)