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
42
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、effected
B、beaten
C、slapped
D、affected
答案
D
解析
本题考查的是动词的使用及对上下文逻辑关系的掌握。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。What is actually affected“实际受到影响”。故选D。
转载请注明原文地址:https://jikaoti.com/ti/PH6sFFFM
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
U.S.EatsTooMuchSaltPeopleintheUnitedStatesconsumemorethantwicetherecommendedamountofsalt,raisingtheirr
KnowingYourRealPersonalityfromSleepingPositionsEveryonehasgottwopersonalities—theonethatisshowntotheworld
FriendlyRelationswiththePeopleAround1Youdependonallthepeoplecloselyaroundtogiveyouthewarmfeelingofbelongin
WalkingBarefootCanHelpPreventSomeInjuriesWalkingbarefoothelpstoimprovebalance,postureandpreventcommonfootin
Youshouldhaveblendedthebutterwiththesugarthoroughly.
Whichofthefollowingcanhelpapersonquitsmoking?Nicotinegumisusedtohelpasmoker
HealthyFoodStreetsellers,particularlyindevelopingcountries,supplylargeamountsoffood(51)peopleonlowincomes.Thi
Thepolicebelievethemotiveforthemurderwasjealousy.
Iamheartilygratefultoyourhelp.
GunRightsintheUSImmediatelyaftertheshootingatVirginiaTechUniversity,Americansgatheredtomournthedead.Thepresi
随机试题
“阳脉之海”指的是
A.口腔糜烂B.口唇干裂C.口唇糜烂D.口角流涎E.口唇青黑脾胃积热上蒸可见
《医疗机构管理条例》的执业要求中规定,医疗机构执业必须
资源利用水平随着经济技术的进步不断突破原有界限,朝阳产业得到成长,是产业的()。
商业银行贷款经营的主要内容包括()。
阿留传(明)陆容阿留者,太仓周元素家僮也。性痴呆无状,而元素终蓄之。尝使执洒扫,终朝运帚,不能洁一庐。主人怒之,则帚掷地,曰:“汝善是,曷烦我为?”元素或他出,使之应门。宾客虽稔熟
家庭承包的土地承包经营权转让的,原承包方与发包方的承包关系()。
下列关于党的重要思想,按提出时间先后顺序排列正确的是:①社会主义市场经济理论②“三个代表”重要思想③社会主义本质理论④构建社会主义和谐社会理念
原型化方法是软件开发中一类常用的方法,它与结构化方法相比较,更需要
使用索引的主要目的是
最新回复
(
0
)