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
13
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 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先生对纸板进行了折叠,并用一种专利树脂加以处理,使之成形、固定,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://tihaiku.com/zcyy/2805860.html
相关试题推荐
With10,600bicyclesincirculation,Pariscityofficialsarehopingthepro
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
随机试题
有一垂直放置的渐缩管,内径由d1=300mm渐缩至d2=150mm,水从下而上自
劳力型心绞痛的典型心电图改变是A.ST-T呈鱼钩样降低,T波倒置 B.ST段抬
春秋战国时期,社会经济发展比现在落后,但当时诸子峰起、百家争鸣,是中华文化史上的
2009~2012年间全国商品进出口总额最高年份,矿产品进出口总额比
站用交流电源系统精益化评价细则交接试验报告,没有资料的,扣();0.05分$;$
每年评价变电站数量为管辖范围内变电站总数的()。二分之一$;$三分之一$;$四分
坐在湖边,思如走马,不觉时光之过,一瞥眼间,忽见身畔石壁上隐隐似有彩色流动,凝神
具有明显舒张肾血管、增加肾血流量的作用的药物是A.肾上腺素 B.异丙肾上腺素
2020年度中国公民张某取得如下收入: (1)每月工资7000元,已
根据税务行政法制的规定,下列税务行政处罚,需要采取听证程序的是()。A.对
最新回复
(
0
)