首页
登录
职称英语
The first bicycles were made of wood. Cycle manufacturers then switched to s
The first bicycles were made of wood. Cycle manufacturers then switched to s
游客
2023-07-03
29
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 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. [br] What can be learned about the brakes of Mr. Gafni’s bicycle?
选项
A、They contain some car technology.
B、They are made of plastic from recycled bottles.
C、Their details are still unknown to the public.
D、They can bear a weight of 220kg.
答案
C
解析
细节辨认题。由定位句可知,车闸也是使用了可回收材料,但Gafni先生还不打算将细节进行公开,因此C)正确。
转载请注明原文地址:https://tihaiku.com/zcyy/2805862.html
相关试题推荐
With10,600bicyclesincirculation,Pariscityofficialsarehopingthepro
With10,600bicyclesincirculation,Pariscityofficialsarehopingthepro
With10,600bicyclesincirculation,Pariscityofficialsarehopingthepro
With10,600bicyclesincirculation,Pariscityofficialsarehopingthepro
Cigarettesmokingkills.Thatweknow.So,manufacturersmade【B1】______cigar
Cigarettesmokingkills.Thatweknow.So,manufacturersmade【B1】______cigar
Cigarettesmokingkills.Thatweknow.So,manufacturersmade【B1】______cigar
Cigarettesmokingkills.Thatweknow.So,manufacturersmade【B1】______cigar
Cigarettesmokingkills.Thatweknow.So,manufacturersmade【B1】______cigar
Cigarettesmokingkills.Thatweknow.So,manufacturersmade【B1】______cigar
随机试题
[originaltext]W:Ienjoycountrymusic.M:SodoI.Butjazzismyfavoriteand
ACMEAtlanticisawell-knownandrespectedtradingcompany.Wehandleimport
Theteacher______thestudentsoftheirbadhabit.A、curesB、treatsC、remediesD
SevenWaystoCreateaHappyHouseholdA)Everyfamilyisdifferent,wit
刘女士,49岁,身高1.6米,体重75公斤。三年前确诊为糖尿病,接受糖尿病药物治
按照我国现行管理体制,施工方项目经理()。A、是施工企业法定代表人 B、是
明确学校教育和家庭教育的权责边界 【背景链接】 针对有政协委员提出的
某务工人员,施工中遭受外力重击,需要给予输血治疗,根据《临床输血技术规范》规定,
根据他励直流电动机的机械特性,由负载力矩引起的转速降落△n符合下列哪一项关系?(
男婴,10个月。出生后牛奶喂养,经常出现多汗、烦躁,近一周加重,偶有腹泻、呕吐。
最新回复
(
0
)