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
24
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
企业人事管理不仅对内部的员工负责,也必须(),不断提高员工的职业生活质量。
工程监理企业专业资质原则上分为甲、乙、丙三个级别,并按照工程性和技术特点划分为(
作为工程定额体系的重要组成部分,施工定额是( )。
关于审计计划,下列说法中错误的是( )。
一般而言,进行套利操作时应遵循的基本原则包括()。
关于等级相关,不正确的是( ) A.当总体的分布类型未知时可用等级相关 B
患者,女,60岁。因急性心肌梗死入院,病情不稳定。该患者出现哪项心律失常时需高度警惕室颤的发生A.房室传导阻滞B.窦性心动过速C.室上性心动过速D.房颤
孔子在敬业上提出了“执事敬”的要求,其意为()。 (A)恭敬地对待工作(B)开展工作时保持静心 (C)尊敬领导(D)坚持人格平等
共用题干 男,63岁。不慎滑倒后感觉右髋部疼痛,不能站立及行走。体检发现右髋部肿胀,皮下淤血,压痛(+),纵向叩痛(+)。患肢呈屈曲、外旋、短缩畸形考虑患者最
求助者一般资料:母林,女,19岁,高中学生,班长。 求助问题:因为理科成绩很好,半年以前母林从文科班转入理科(3)班,最近被选为班长。母林对该班级的...