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
49
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!
What caused the Orbiter’s problem?
选项
A Scientists used wrong guidelines of mathematics.
B Scientists used wrong building materials.
C Scientists used different measurement systems.
D Scientists used different operating systems.
答案
C
解析
第三段讲解了飞行器出现问题的原因,即英美米制的不同。
转载请注明原文地址:https://ti.zuoweng.com/ti/FvpQKKKQ
相关试题推荐
AnExpensiveMistake Istherewaterontheplanetmars?IstherelifeonMar...
AnExpensiveMistake Istherewaterontheplanetmars?IstherelifeonMar...
AnExpensiveMistake Istherewaterontheplanetmars?IstherelifeonMar...
AnExpensiveMistake Istherewaterontheplanetmars?IstherelifeonMar...
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...
共用题干 第一篇AnExpensiveMistakeIstherewaterontheplanetMars?Istherelife...
AnExpensiveMistake Istherewaterontheplanetmars?IstherelifeonMar...
AnExpensiveMistake Istherewaterontheplanetmars?IstherelifeonMar...
随机试题
在保险销售中,如果保险代理从业人员代投保人签字,将导致的结果是( )。 A、
控制活动是指有助于确保管理层的指令得以执行的政策和程序,下列活动中,不属于控制活
(75-78题共用题干) 男性,43岁,右腰部钝痛2年,B超检查发现右肾盂结石
采用顶管法施工时,应在工作坑内安装的设备有()。
C从每行来看,第一个图形顺时针旋转90°得到第二个图形,第一个图形左右翻转得到第三个图形,故本题选C。
根据工业炉热工制度分类,下列工业炉中属间断式炉的是()
三令五申:孙武 A四面楚歌:刘邦 B指鹿为马:项羽 C毛遂自荐:杜甫
D每组图形中两边图形的小圆数之和等于中间图形的小圆数目,故答案为D。
关于制作全口义齿排牙的原则,下列错误的是A.排前牙应注意切导斜度宜大不宜小B.排前牙时应切忌排成深覆C.要求后牙的轴线与力线平行而垂直于牙槽嵴D.要求后牙
根据规定,下列可以用于抵押的林权包括( )。A、用材林、经济林、薪炭林的林木所有权B、用材林、经济林、薪炭林的林木使用权C、水源涵养林、水土保持林、防风固沙