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
自考
The basic principle of radar is illustrated by what happens when one shouts in a cave. The echo of the shouting (11)______ the
The basic principle of radar is illustrated by what happens when one shouts in a cave. The echo of the shouting (11)______ the
admin
2009-01-10
73
问题
The basic principle of radar is illustrated by what happens when one shouts in a cave. The echo of the shouting (11)______ the walls helps a person determine the size of the cave. With radar,however,the waves are radio waves instead of (12)______ waves. Radio waves travel (13)______ the speed of light,about300,000 kilometers in a second. A radar set (14)______ a short burst of radio waves. Then it receives the echoes (15)______ when the waves bounce(反射) off objects. By determining the time it (16)______ for the echoes to return to the radar set,a trained technician (17)______ determine the distance between the radar set and other objects. The word“radar”, (18)______ ,gets its name from the term“radio detection and ranging. ”“Ranging”is the term for detection of the (19)______ between an object and the radar set.
Besides being of critical importance to pilot,radar is (20)______ for air traffic control,for tracking ships at sea,and for tracking weather systems and storms.
选项
A、spends
B、takes
C、kills
D、makes
答案
B
解析
根据上文意为收到。takes:收到。
转载请注明原文地址:https://kaotiyun.com/show/h9AR777K
本试题收录于:
英语(二)题库公共课分类
0
英语(二)
公共课
相关试题推荐
WhenIwasachild,Ilivedwithmymother,myfatherhavingbeenawaytoworkinthetown.Iwasthennot(11)______nineyears
Toonewhohasrecentlyreachedtheadvancedageofforty-six,therapidlyapproachingprospect(前景)ofoldageisbothexcitinga
Idon’twant______whileinasecondsleepevenifsomethingserioushappens.
Anewtechnique______,theyieldsasawholeincreasedby20percent.
Oneofthemostexcitingraceseverrunisnowinprogressbetweendoctorsfightingmalaria(疟疾)andmosquitoes.Accordingtothe
WhatdowemeanbyaperfectEnglishpronunciation?Inone【11】thereareasmanydifferentkindsofEnglishastherearespeakers
Manyawriterofnewspaperarticles______(have)turnedtowritingnovels.
Henry’sjobwastoexaminecarswhichcrossedthefrontiertomakesurethattheywerenotsmugglinganythingintothecountry.
TheImpactoftheInternetonSociety【T1】______Althoughitbeganasagovernmentoperation,overtimethisinnovativetech
A.seriousandprofessionalB.theyweremembersofdifferentorganizationsC.hospitaldoctorsstopwearingtiesD.whodoesno
随机试题
当一行字数比较多的时候,容易看串行,此时一般都采用分栏的方式。
风险综合评价法的步骤包括()。
工伤职工有下列________情形的,不属于停止享受工伤保险待遇。()
传统计价模式所采用的计价方式是()。
退休职工李某本月取得的下列收入中,不需缴纳个人所得税的有()。
甲公司为增值税一般纳税人,适用的增值税税率为17%,商品、原材料售价中均不含增值税。假定销售商品、原材料和提供劳务均符合收入确认条件,其成本在确认收入时逐笔结转,不考虑其他因素。2013年12月,甲公司发生如下交易或事项:(1)1日,与乙公司签订为期6个月
下列各项中,属于民事责任形式的是()。
甲、乙、丙、丁按份共有一栋房屋,份额相同。为提高该房屋使用价值,甲向乙、丙、丁提议拆旧翻新。在共有人之间未就该事项做出明确约定的情况下,下列表述中,不符合物权法律制度规定的是()。
下列关于综合布线系统的描述中,错误的是()。
Togetmytravellers’chequesIhadto____aspecialchequetothebankforthetotalamount.
最新回复
(
0
)