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
The first bicycles were made of wood. Cycle manufacturers then switched to steel tubes. These days, for high-end bikes where wei
The first bicycles were made of wood. Cycle manufacturers then switched to steel tubes. These days, for high-end bikes where wei
admin
2013-10-22
29
问题
The first bicycles were made of wood. Cycle manufacturers then switched to steel tubes. These days, for high-end bikes where weight is at a premium, they use aluminium alloys(铝合金)or even carbon fibre. But Izhar Gafni, an amateur cyclist who owns a number of such fancy bikes, wonders whether the original inventors had a point. He proposes to go back to using wood—or, rather, a derivative(衍生物)of wood, namely cardboard.
Mr. Gafni, who is based in Ahituv, Israel, spent years trying to work out how to make a cardboard bicycle able to support the weight of a human being. The trick is twofold. First, he folds the cardboard commercial-grade material, made from recycled paper to increase its strength. Then, once it is folded, he treats the result with a proprietary resin(树脂)that holds it in shape and stiffens it, before cutting it into the form of the component required. A second application of resin renders the component waterproof, and a lick of lacquer(漆)makes it look good. The result, Mr. Gafni claims, is stronger than carbon fibre.
The bike’s frame, wheels, handlebars and saddle are all made of cardboard in this way, and then fitted together. The tyres—again harking back to the early days of cycling—are composed of solid rubber, which is recycled from old car tyres. That makes the ride a little harder than if the tyres were pneumatic(充气轮胎的), but means they cannot be punctured.
The chain is also made from car-tyre rubber. The pedals are plastic recycled from bottles and the brakes are recycled too, though Mr. Gafni is not yet ready to disclose the details. The finished product weighs 9kg, a bit less than an ordinary bike, and can carry a rider weighing 220kg.
Mr. Gafni’s target market is the poorer countries of the world. Because manufacturing the cardboard bike will, he reckons, cost $9-12 a unit, his design is far more affordable than a steel-framed bike. But people in rich countries may be interested too. In Tel Aviv, the commercial capital of Mr. Gafni’s native land, 2 000 stolen bikes were recently put on display by police, for their owners to claim. If bicycles cost less than the locks that chained them to lampposts, thieves might not think it worthwhile to steal them.
What effect does the proprietary resin have on the cardboard?
选项
A、It makes the bicycle even lighter.
B、It helps the cardboard to maintain its shape.
C、It makes the cardboard easy to fold.
D、It gives the bicycle a good look.
答案
B
解析
细节辨认题。由定位句可知,Gafni先生对纸板进行了处理,将其再次折叠,并用一种专利树脂加以处理,使之成形、同定。因此B)“帮助纸板保持形状”为正确答案。
转载请注明原文地址:https://jikaoti.com/ti/w0QFFFFM
0
大学英语四级
相关试题推荐
Thereare【B1】______waysyoucanfindoutaboutthecountriesandplacesyouwishtovisit.Youcantalktofriendswhohave【B2
WhatisitaboutAmericansandfood?Welovetoeat,butwefeel【S1】______aboutitafterward.Wesaywewantonlythebest,but
Alandfreefromdestruction,pluswealth,naturalresources,andlaborsupply—allthesewereimportant【C1】______inhelpingEngl
Alandfreefromdestruction,pluswealth,naturalresources,andlaborsupply—allthesewereimportant【C1】______inhelpingEngl
EachUSDAbeefgradeisameasureofadistinctlevelofquality.Becausebeefcanvarysomuchin【S1】______,ittakeseightg
EachUSDAbeefgradeisameasureofadistinctlevelofquality.Becausebeefcanvarysomuchin【S1】______,ittakeseightg
EachUSDAbeefgradeisameasureofadistinctlevelofquality.Becausebeefcanvarysomuchin【S1】______,ittakeseightg
Howoldis"old"?Theanswerhaschangedovertheyears.Twohundredyearsago,youwereoldat35.Thatwastheaveragelifeex
Todaywetalkaboutthedifferencebetweenacollegeandauniversity.Collegesanduniversitieshavealotin【B1】______.Theyp
SevenWaystoSavetheWorldA)Forgettheoldideathatconservingenergyisaformofself-denial—ridingbicycles,dimmingthe
随机试题
A、Theyarethesmallestsatellites.B、Theyarepoweredbywater.C、Theyaremadebycollegestudents.D、TheyarebackedbyNASA.
紫外分光光度计不需进行仪器检查项目是:
子肿的发病机制有
贫血、皮肤瘙痒是慢性肾衰竭病人最早期的表现。
市场容量的调查包括三个方面:有效需求、()、需求的增长速度。
在时间节约价值的估算中,关于出行时间节约价值,表述正确的有()
季度施工进度计划是在年度施工进度计划的基础上,按照()施工原则编制。
一个完整的退休规划包括()等内容。
下列项目中,应计入固定资产价值的有()。
学校产生所需要的三个基本条件是()
最新回复
(
0
)