首页
财务会计
医药卫生
金融经济
考公考编
外语考试
学历提升
职称考试
建筑工程
IT考试
其他
登录
职称考试
An Expensive Mistake Is there water on the planet mars?Is there life on Mar...
An Expensive Mistake Is there water on the planet mars?Is there life on Mar...
admin
2020-12-24
20
问题
An Expensive Mistake
Is there water on the planet mars?Is there life on Mars? Was there ever life on Mars? Scientists from NASA wanted to know the answers to these questions. They built a spacecraft to travel around mars and get information. The spacecraft was called the Mars Climate Orbiter.
The Mars Climate Orbiter left for mars in December 1998. The trip took nine and a half months. At first, everthing was fine. However, when the Orbiter got near Mars, something terrible happend. The spacecraft didn’t go to the right place. It went too close to Mars. It was too hot to the Orbiter there.The spacecraft couldn’t function correctly. Suddenly, it stopped sending messages to NASA. The Orbiter was lost.
How could this terrible thing happen?How did the Orbiter get closer to Mars than the scientists planned? Finally, they found the answer. Two teams of scientists worked together on the Orbiter. One team was in England,and one team was in the United States. There were many similarities in the way they worked, but there was one important difference:The teams used different guidelines for measuring things. The United States team used the metric system (公制).The other team used the English system.
Because they used different systems,the scientists made a mathematical mistake. The Orbiter's orbit (the shape and pattern of its path) around Mars was not correct. The scientists put the Orbiter on the wrong path. The Orbiter got too close and too hot, and it stopped functioning.
Why didn’t anybody see the mistake before it was too late? Many things contributed to the problem. One thing was that NASA scientist and mathematicians were working on two other spacecrafts at the same time. This was a challenge, and they were very tired from working long hours.
The Mars Climate Orbiter cost $94 million to build. It also cost a lot of money to try to find the lost Orbiter in space. In addition , NASA's research on the cause of the problem was very expensive. This wasn't the first time that two different measurement systems caused mistakes in scientific projects. However, the Mars Climate Orbiter was definitely the most expensive mistake of all!
How long did it take the Orbiter to get close to Mars?
选项
A One year.
B Less than one year.
Cbout two and a half years.
D More than three years.
答案
B
解析
第二段第二句"The trip took nine and a half months. ”,由此可知飞行器接近火星用了不到一年的时间。
转载请注明原文地址:https://ti.zuoweng.com/ti/DydQKKKQ
相关试题推荐
AnExpensiveMistake Istherewaterontheplanetmars?IstherelifeonMar...
AnExpensiveMistake Istherewaterontheplanetmars?IstherelifeonMar...
Theaccidentoccurredjustbecauseofhismistakeindriving.()A.happenedB.brok
共用题干 第一篇AnExpensiveMistakeIstherewaterontheplanetMars?Istherelife...
共用题干 第一篇AnExpensiveMistakeIstherewaterontheplanetMars?Istherelife...
共用题干 第一篇AnExpensiveMistakeIstherewaterontheplanetMars?Istherelife...
Areyoupositivethatthere'sbeennomistake?
AnExpensiveMistake Istherewaterontheplanetmars?IstherelifeonMar...
AnExpensiveMistake Istherewaterontheplanetmars?IstherelifeonMar...
Itseemedinevitableforhimtomakesuchmistakebecauseofhiscarelessness.()
随机试题
(43-44题共用备选答案) A.疏肝解郁,行气止痛 B.行气散结,降逆化痰
与胃癌和胃黏膜病相关的致病菌是 A.霍乱弧菌 B.沙门菌 C.大肠埃希菌
现代物理学理论认为,介子与质子、中子等基本粒子一样也是由夸克所组成,但又不同于
基金管理人应当在自收到核准文件之日起()内进行基金份额的发售。
下列选项中属于本土企业的战略选择的有( )。
男性,67岁,有长期吸烟史,脊柱手术后卧床2周,出现右腿小腿疼痛、紧束感,并逐渐
用人单位自主用人权的说法,错误的是()。
关于医患双方权利写义务的下述口号和做法中,不可取的是A、医者不是上帝B、患者是上帝C、把维护患者正当权利放在第一位D、医者的正当权益也必须得到保证E、患
某投资项目预计每年的现金流量如下表所示,如基准收益率为10%,则该项目的净现值为()万元。已知(P/A,10%,5)=3.7908A:-66.3B:66.3
Z公司是一家家电制造企业,销售渠道一直受限制。为此,Z公司通过建立自己品牌的零售专卖店,向家电零售业发展,以减轻对零售商的依赖。Z公司采用的发展战略是()。A