首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
The car, and the roads it travels on, will be revolutionized in the twenty first century. The key to tomorrow’s "smart cars" wil
The car, and the roads it travels on, will be revolutionized in the twenty first century. The key to tomorrow’s "smart cars" wil
admin
2017-06-11
39
问题
The car, and the roads it travels on, will be revolutionized in the twenty first century. The key to tomorrow’s "smart cars" will be sensors. "We’ll see vehicles and roads that see and hear and feel and smell and talk and act," predicts Bill Spreitzer, technical director of General Motors Corporation’s ITS program, which is designing the smart car and road of the future.
Approximately 40, 000 people are killed each year in the United States in traffic accidents. Fully half of these fatalities come from drunk drivers, and many others from carelessness. A smart car could eliminate most of theses car accidents. It can sense if a driver is drunk via electronic sensors that can pick up alcohol vapor in the air, and refuse to start up the engine. The car could also alert the police and provide its precise location if it is stolen.
Smart cars have already been built which can monitor one’s driving and the driving conditions nearby. Small radars hidden in the bumpers can scan for nearby cars. Should you make a serious driving mistake, the computer would sound an immediate warning.
At the MIT Medial Lab, a prototype is already being built which will determine how sleepy you are as you drive, which is especially important for long-distance truck drivers. The monotonous, almost hypnotic process of staring at the center divider for long hours is a grossly underestimated, life-threatening hazard. To eliminate this, a tiny camera hidden in the dashboard can be trained on a driver’s face and eyes. If the driver’s eyelids close for a certain length of time and his or her driving becomes erratic, a computer in the dashboard could alert the driver.
Two of the most frustrating things about driving a car are getting lost, and getting stuck in traffic. While the computer revolution is unlikely to cure theses problems, it will have a positive impact. Sensors in your car tuned to radio signals from orbiting satellites can locate your car precisely at any moment and warn of traffic jams. We already have twenty-four Navstar satellites orbiting the earth, making up what is called the Global Positioning System. They make it possible to determine your location on the earth to within about a hundred feet. At any given time, there are several GPS satellites orbiting overhead at a distance of about 11,000 miles. Each satellite contains four "atomic clocks" , which vibrate at a precise frequency, according to the laws of the quantum theory.
As a satellite passes overhead, it sends out a radio signal that can be detected by a receiver in a car’s computer. The car’s computer can then calculate how far the satellite is by measuring how long it took for the signal to arrive. Since the speed of light is well known, any delay in receiving the satellite’s signal can be converted into a distance. In Japan there are already over a million cars with some type of navigational capability.(Some of them locate a car’s position by correlating the rotations in the steering wheel to its position on a map)
With the price of microchips dropping so drastically, future applications of GPS are virtually limitless, " The commercial industry is poised to explode," says Randy Hoffman of Magellan Systems Corp. which manufactures navigational systems. Blind individuals could use GPS sensors in walking sticks, airplanes could land by remote control, hikers will be able to locate their position in the woods— the list of potential uses is endless.
What does the commercial industry in the passage refer to?
选项
A、It refers to the industry to which smart cars are applied commercially.
B、It refers to the industry to which sensors are applied commercially.
C、It refers to the industry to which GPS is applied commercially.
D、It refers to the industry to which microchips are applied commercially.
答案
C
解析
细节题。从第7段首句可知,commercial industry(商业行业)指的是与GPS相关的导航业务。故选C。
转载请注明原文地址:https://kaotiyun.com/show/RVFO777K
0
考博英语
相关试题推荐
Accordingtotherecentcensus,under-18s____nearly95%ofthesinglechildreninChinesefamilies.
ThismonthSingaporepassedabillthatwouldgivelegalteethtothemoralobligationtosupportone’sparents.CalledtheMai
InTheBirthOrderBook:WhyYouAretheWayYouAre(2004),Dr.KevinLemannotesthat21ofthefirst23Americansinspacewer
Duringthefamine,manypeoplewere____togoingwithoutfoodfordays.
Duringthepastgeneration,theAmericanmiddle-classfamilythatoncecouldcountonhardworkandfairplaytokeepitselffin
In1984,PresidentRonaldReaganproposedthattheUnitedStatesconstructalaunchlaboratoryforaneweraofspaceexploratio
Thirty-onemillionAmericansareover60yearsofage,andtwenty-ninemillionofthemarehealthy,busy,productivecitizens.By
ThestudyoflawhasbeenrecognizedforcenturiesasabasicintellectualdisciplineinEuropeanuniversities.However,onlyin
Thirty-onemillionAmericansareover60yearsofage,andtwenty-ninemillionofthemarehealthy,busy,productivecitizens.B
随机试题
小王父母双亡,由其外祖父监护并担当代理人,小王参加画展获奖,外祖父代其领奖品时,发奖单位要求其证明自己是小王的法定代理人,该要求是()。A.无权行为B.必要行为C.义务行为D.有权行为
A.麻黄汤合五苓散B.麻黄汤合五皮饮C.麻黄连翘赤小豆汤D.越婢加术汤E.五皮饮合五苓散治疗急性肾小球肾炎风热犯肺,水邪内停证,应首选()
抗结核病药的耐药性A、单耐药B、多耐药C、耐多药D、防止耐药E、获得性耐药分离菌株对多种一线药物耐药,但不包括异烟肼和利福平
自然光以60。的入射角照射到某两介质的交界面时,反射光为完全偏振光,折射光为()。
违约风险暴露不包括()。
(2010年考试真题)甲公司为增值税一般纳税人,适用的增值税税率是17%,所得税税率是25%,年末一次确认全年所得税费用。商品、材料销售均不含增值税,商品、材料销售成本随销售收入的确认逐笔结转,本年利润采用表结法核算。有关资料如下:资料1:2008年甲公
公元25年,刘秀建国。定都洛阳,史称“东汉”。刘秀在位时,出现了“开元之冶”的局面。()
阅读下列材料并回答问题。材料一:到18世纪末,英国贵族、乡绅、商人的数量达到69.8万人。他们有相当的经济基础能够维持一掷千金的奢侈生活,服饰作为他们身份和财富的象征。其花费必不可少。随着英国社会各阶层之间的频繁流动,一些原来的社会底层
【2012福建】基础教育课程改革倡导的教师观是()。
A、 B、 C、 D、 A题于中每个图形都是由5条长度相等的线段组成的。
最新回复
(
0
)