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
It sounds all wrong-drilling holes in a piece of wood to make it more resistant to knock. But it works because the energy from t
It sounds all wrong-drilling holes in a piece of wood to make it more resistant to knock. But it works because the energy from t
admin
2011-01-05
46
问题
It sounds all wrong-drilling holes in a piece of wood to make it more resistant to knock. 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 (51) centuries that some woods are tougher than others. Hickory(山核桃木), for example, was turned into axe handles and cartwheel spokes (车轮辐条) because it can absorb shocks without breaking. White oak (橡木), for example, is much more easily damaged, (52) 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(管状的) vessels that run (53) 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 (54) 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 millimeters across into a block of spruce(云杉), a wood with (55) vessels, and found that (56) withstood a harder knock. (57) 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 (58) . All the energy from the blow goes towards breaking the material in one or two places, but often the pieces left (59) 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 (60) the wood breaks, and it can then absorb more (61) , more safely".
The researchers believe the principle could be applied to any material- (62) example, to manufacture lighter and more protective packaging. That could (63) be used in car bumpers (保险杠), crash barriers and armor for military vehicles, says Ulrike Wegst, (64) the Max Plank Institute for Mental Research in Stuttgart. But she emphasizes that you’d (65) to design the substance with the direction of force in mind. "The direction of loading is crucial", she says.
选项
A、also
B、besides
C、else
D、yet
答案
A
解析
本题考查的是对文章上下文的理解与副词的辨析。also属于连接副词,表添补,它的功能是指上面提到的原则也适用于其他地方。空格所在句子的上文说:研究人员相信,这个原则可用于任何一种材料,例如可用于制造更轻、保护功更强的包装物。本句说的是这一原则还可用在汽车的减震器等。故选A。
转载请注明原文地址:https://kaotiyun.com/show/A9Qd777K
本试题收录于:
职称英语理工类C级题库职称英语分类
0
职称英语理工类C级
职称英语
相关试题推荐
Common-coldSenseYoucan’tbeatit,butyoudon’thavetojoinit.Maybeitgotthename"commoncold"becauseit’smorec
Common-coldSenseYoucan’tbeatit,butyoudon’thavetojoinit.Maybeitgotthename"commoncold"becauseit’smorec
Common-coldSenseYoucan’tbeatit,butyoudon’thavetojoinit.Maybeitgotthename"commoncold"becauseit’smorec
Thewayonelooks,talksandmovesdependsBrothersandsistersoftenlookabitdifferentfromeachotherbecause
InitiallythewriterdidnotwanttobuyahearingaidbecauseManypeopleleavetheirhearingproblemuntreatedbecause
InitiallythewriterdidnotwanttobuyahearingaidbecauseAccordingtothepassage,hearinglossis
InitiallythewriterdidnotwanttobuyahearingaidbecauseWhichofthefollowingisNOTtrueofCrystalEar?
Becauseheadachesareapartofalmostallofourlives,peoplewithchronicheadachessometimesdon’trealizethattheymaynee
Theauthor’sprimarypurposeis______。Itcanbeinferredthatdoctorsareabletodeterminehospitalpoliciesbecause______.
随机试题
正剧
道德发展的最低层次是()。
下列关于休克病人预防急性肾衰的措施中正确的是
患者,男,65岁,血压180/110mmHg,服降压药后血压控制在130~140/80~90mmHg,心电图室左室肥厚,眼底视网膜动脉变窄,尿蛋白微量。该患者最可能的诊断是()
下面关于价值工程的论述中正确的是:
无损探伤检验方法中,仅能够发现焊缝表面和近表面缺陷的方法是()。
会议总结的形式有()
已知二次不等式2x2一ax≥—1对于所有x∈(0,1]均成立,则a的最大值为().
请说明选择统计检验程序的方法时要考虑哪些条件,才能正确应用统计检验方法分析问题。
ComedianGeorgeCarlinhasaroutineinwhichhetalksabouthowhumansseemtospendtheirlivesaccumulating"stuff"Oncethey
最新回复
(
0
)