怎么作。。。
答案:2 悬赏:70 手机版
解决时间 2021-01-31 19:11
- 提问者网友：欲劫无渡
- 2021-01-30 20:52
怎么作。。。
最佳答案
- 五星知识达人网友：平生事
- 2021-01-30 22:11
In 1839, Kirkpatrick Macmillan, a Scottish blacksmith,invented a much better bicycle. Macmillan’s machine had iron-covered wheels tokeep them from getting worn down. He also used foot-operated levers, similar topedals, so his bicycle could be ridden at a quick pace. It didn’t look muchlike the modem bicycle, though, because its back wheel was substantially largerthan its front wheel. Although Macmillan’s bicycles could be ridden easily,they were never produced in large numbers.
In 1861, Frenchman Pierre Michaux and his brotherErnest invented a bicycle with an improved pedal mechanism. They called theirbicycle a velocipede，but most people called it a “bone shaker”because of the effect of the wood and iron frame. Despite the impolitenickname, the velocipede was a hit. After a few years, the Michaux family wasmaking hundreds of the machines annually, mostly for fun-seeking young people.
Ten years later, James Starley , an English inventor,made several innovations that revolutionized bicycle design. He made the frontwheel many times larger than the back wheel, put a gear on the pedals to makethe bicycle more efficient，and lightened the wheelsby using wire spokes. Although this bicycle was much lighter and less tiring toride, it was still clumsy, extremely top-heavy，andridden mostly for entertainment.
It wasn’t until 1874 that the first truly modernbicycle appeared on the scene. Invented by another Englishman, H. J. Lawson,the safety bicycle would look familiar to today’s cycli追答原文追问不是这个啊追答噗……发错了追问。。。。。追答Bicycles are very popular aroundthe world today. People ride their bicycles for exercise and enjoyment. In someplaces, people use a bicycle to get to work. In other places, bicycle riding isa very popular exercise to people who live in cities. But who invented the firstbicycle?
In 1791, a Frenchmannamed Comte de Siverac invented and owned the first bicycle. Mrs. Sivrac rodethe bicycle in Paris. The handles(把手) andthe seat were wooden. This bicycle was very difficult to move. A rider even hadto pick up the front wheel to change direction. Finally, the bicycle had nobrakes for stopping or pedals for the feet! Riding a bicycle was a great risk!
In 1817, a Germannamed Baron von Draus de Sauerbrun made the first bicycle better. The seatbecame more comfortable. The wheel could now change direction. His ride in theforest took only one hour instead of three hours on foot, which surprisedpeople at that time.还是不对……追问
追答对了？追问是选择题
In 1861, Frenchman Pierre Michaux and his brotherErnest invented a bicycle with an improved pedal mechanism. They called theirbicycle a velocipede，but most people called it a “bone shaker”because of the effect of the wood and iron frame. Despite the impolitenickname, the velocipede was a hit. After a few years, the Michaux family wasmaking hundreds of the machines annually, mostly for fun-seeking young people.
Ten years later, James Starley , an English inventor,made several innovations that revolutionized bicycle design. He made the frontwheel many times larger than the back wheel, put a gear on the pedals to makethe bicycle more efficient，and lightened the wheelsby using wire spokes. Although this bicycle was much lighter and less tiring toride, it was still clumsy, extremely top-heavy，andridden mostly for entertainment.
It wasn’t until 1874 that the first truly modernbicycle appeared on the scene. Invented by another Englishman, H. J. Lawson,the safety bicycle would look familiar to today’s cycli追答原文追问不是这个啊追答噗……发错了追问。。。。。追答Bicycles are very popular aroundthe world today. People ride their bicycles for exercise and enjoyment. In someplaces, people use a bicycle to get to work. In other places, bicycle riding isa very popular exercise to people who live in cities. But who invented the firstbicycle?
In 1791, a Frenchmannamed Comte de Siverac invented and owned the first bicycle. Mrs. Sivrac rodethe bicycle in Paris. The handles(把手) andthe seat were wooden. This bicycle was very difficult to move. A rider even hadto pick up the front wheel to change direction. Finally, the bicycle had nobrakes for stopping or pedals for the feet! Riding a bicycle was a great risk!
In 1817, a Germannamed Baron von Draus de Sauerbrun made the first bicycle better. The seatbecame more comfortable. The wheel could now change direction. His ride in theforest took only one hour instead of three hours on foot, which surprisedpeople at that time.还是不对……追问
追答对了？追问是选择题
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- 1楼网友：第四晚心情
- 2021-01-30 22:18
不会
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