首页
登录
职称英语
The first bicycles were made of wood. Cycle manufacturers then switched to
The first bicycles were made of wood. Cycle manufacturers then switched to
游客
2024-01-20
7
管理
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 a priority, 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, and 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. [br] What is the major reason for having solid rubber tyres for the cardboard bicycle?
选项
A、They can help lower the cost.
B、They are environment-friendly.
C、They can ensure the safety of the rider.
D、They are more endurable.
答案
D
解析
由题干中的solid rubber tyres定位到第三段最后一句。推理判断题。由定位句可知。用固体橡胶做成的轮胎不容易被刺破,因此D)“它们更耐用”为正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3380180.html
相关试题推荐
Thefirstbicyclesweremadeofwood.Cyclemanufacturersthenswitchedto
Thefirstbicyclesweremadeofwood.Cyclemanufacturersthenswitchedto
Thirtyyearsago,mostteenagershadbicycles,butnowtheyarecomparativel
Thirtyyearsago,mostteenagershadbicycles,butnowtheyarecomparativel
Thirtyyearsago,mostteenagershadbicycles,butnowtheyarecomparativel
Thirtyyearsago,mostteenagershadbicycles,butnowtheyarecomparativel
Thirtyyearsago,mostteenagershadbicycles,butnowtheyarecomparativel
Thirtyyearsago,mostteenagershadbicycles,butnowtheyarecomparativel
Thirtyyearsago,mostteenagershadbicycles,butnowtheyarecomparativel
Thirtyyearsago,mostteenagershadbicycles,butnowtheyarecomparativel
随机试题
[originaltext]W:HowwasyourdinneratthenewItalianrestauranttoday?M:We
Inasense,thenewprotectionismisnotprotectionismatall,atleastnot
Japanisgoingthroughacomplexnationalidentitycrisis.Thatmaybenoba
You______havebeenmorecareful!A、mustB、couldC、wouldD、needB情态动词题。couldhave
火灾报警控制器之间通常釆用()等通信方式进行联网。A.RS483 B.R54
下列财务评价指标中,属于动态指标的有()。A.净现值 B.内部收益率 C
人类行为的基本构成要素包括()。A.行为结果 B.行为手段 C.行为意义
治疗哮喘实证的主穴是A.列缺、尺泽、膻中、肺俞、定喘 B.列缺、尺泽、膻中、肺
下列降糖药物中同时具有抗菌活性的药物为A.罗格列酮 B.胺磺丁脲 C.胰岛素
公共财政的主要职能包括()。A.调控职能 B.稳定职能 C.配置职能 D.
最新回复
(
0
)