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
A、Because it provides precise direction. B、Because it is affordable to ordinary users. C、Because it is the trend of the century.
A、Because it provides precise direction. B、Because it is affordable to ordinary users. C、Because it is the trend of the century.
admin
2015-05-28
21
问题
GPS stands for the Global Positioning System. It refers to a system of satellites and receivers that allow people and devices to detect their precise location on the earth. The heart of the system relies on 24 satellites that orbit the earth twice per day. Devices that are equipped with GPS equipment receive transmissions from at least a few of the satellites and are able to collect very precise positioning data. The first GPS satellite was launched in 1974 and the 24th was launched in 1994. The system is operated by the United States Department of Defense and the use of the system is free for anyone. New satellites are periodically launched to replace aging ones. As the technology has improved, the cost of GPS devices has greatly declined while the accuracy has increased. Small portable GPS receivers have become very affordable, and the accuracy is amazing. Accuracy varies based on various factors, but it can be as good as a few meters !Land-based supplementary devices can be used to improve accuracy if higher precision is required.The application of the GPS is very broad, and as the prices come down the number of uses is increasing. Portable GPS devices are used by fishermen to help them sail around the wild. Many new cars are being equipped with GPS systems to help drivers with finding directions. The military uses GPS to guide cruise missiles to pre-specified targets.
16.According to the passage, what is the most important part of the global positioning system?
17.Which aspect of the GPS is emphasized by the speaker?
18.According to the passage, why is the use of GPS increasing?
选项
A、Because it provides precise direction.
B、Because it is affordable to ordinary users.
C、Because it is the trend of the century.
D、Because it is portable for anyone.
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/bHl7777K
0
大学英语四级
相关试题推荐
A、Listentosomequietmusic.B、Getoutofbedtillbeingsleepyagain.C、Trytorelaxourmind.D、Readsomeinterestingarticle
MyfavoriteT.V.show?"TheTwilightZone."I【B1】______liketheepisodecalled"ThePrinter’sDevil."It’saboutanewspapered
A、Hewillgotothesupermarketwiththewoman.B、Hefeelsuncomfortablewiththewoman’sstaring.C、Hewillbuysomevegetables
Therewasatimewhenanypersonalinformationthatwasgatheredaboutuswastypedonapieceofpaperand【B1】______inafilec
Youprobablyhavenoticedthatpeopleexpresssimilarideasindifferentways,dependingonthesituationtheyarein.Thisisv
A、Aclassreunion.B、Abirthdayparty.C、Aretirementparty.D、Afacultyreception.B对话中女士提到asurprisepartyforhimwhenhetur
A、Hedoesn’talwayslisten.B、Hehasanearinfection.C、He’snevermissedameeting.D、Hehastoattendanothermeeting.A对话中男士
A、Itwasmisleading.B、Itwasenjoyable.C、Itwasratherboring.D、Itwasverydifficult.B女士问男士昨晚是否去听关于法国大革命的讲座了,并说自己以前从未听过这么有趣
A、Sheforgetswhattheyhavedone.B、Shehasbeensick.C、Shewillhelptheman.D、Shemissedsomeclasses.C
A、Shecan’tfindit.B、Shewillfixitrightnow.C、Sheasksthemantosewit.D、Sheforgetswhereitis.B
随机试题
消化性溃疡合并大出血的特点,错误的是()。
孕妇血清人绒毛膜促性腺激素(hCG)浓度达高峰是在妊娠
哪项是毕工式胃大部切除术的优点()
中药七情配伍中的增毒配伍是
中央投资项目招标代理机构资格证书的有效期为()年。
在个别资本成本的计算中,不用考虑筹资费用影响因素的是()。
在认知心理学中,可以把问题解决定义为具有一系列目标指向性的认知操作,它具备的特征有()。
任何无法量化及不设定时限的目标都是无效的目标,而任何无效的目标都没有实际操作的方法。因此,详细的职位规划不是无法量化及不设定时限的目标。为使上述论证成立,必须补充以下哪项作为前提?
设μ=f(x2+y2,xz),z=z(x,y),由ex+ey=ez确定,其中f二阶连续可偏导,求。
【B1】【B5】
最新回复
(
0
)