首页
登录
职称英语
A pilot cannot fly a plane by sight alone. In many conditions, such as flyin
A pilot cannot fly a plane by sight alone. In many conditions, such as flyin
游客
2025-02-02
44
管理
问题
A pilot cannot fly a plane by sight alone. In many conditions, such as flying at night and landing in dense fog, a pilot must use radar, an alternative way of navigating. Since human eyes are not very good at determining speeds of approaching objects, radar can show a pilot how fast nearby planes are moving. The basic principle of radar is exemplified by what happens when one shouts in a cave. The echo of the sounds against the walls helps a person determine the size of the cave. With radar, however, the waves are radio waves instead of sound waves. Radio waves travel at the speed of light, about 300, 000 kilometers in one second. A radar set sends out a short burst of radio waves: Then it receives the echoes produced when the waves bounce off objects. By determining the time it takes for the echoes to return to the radar set, a trained technician can determine the distance between the radar set and other objects. The word "radar," in fact, gets its name from the term "radio detection and ranging." "Ranging" is the term for detection of the distance between an object and the radar set. Besides being of critical importance to pilots, radar is essential for air traffic control, tracking ships at sea, and for tracking weather systems and storms. [br] Which of the following words best describes the tone of this passage?
选项
A、Argumentative.
B、Imaginative.
C、Explanatory.
D、Humorous.
答案
C
解析
推断题型通读全文可见本文使用举例的方式来讲解雷达的功用,工作原理,名字的来源等;因此可推断本文的语气是解释说明式的,选项C为答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3939645.html
相关试题推荐
Apilotcannotflyaplanebysightalone.Inmanyconditions,suchasflyin
Apilotcannotflyaplanebysightalone.Inmanyconditions,suchasflyin
Apilotcannotflyaplanebysightalone.Inmanyconditions,suchasflyin
Apilotcannotflyaplanebysightalone.Inmanyconditions,suchasflyin
Apilotcannotflyaplanebysightalone.Inmanyconditions,suchasflyin
Thetwinsareso______thatIcannottellthemapart.A、alikeB、likelyC、likeD、li
Icannotthankyouverymuchforyourkindness,Iowemysuccesstoyou.A、soB、t
Thoughtheimitationjewelrycanfoolmanypeople,theycannot______uptoanexp
Hecannotseeanythingwithouthisglasses,sohemadea______ofrememberingto
Somemedicalconditionscanoftencurethemselves______,withoutmedicalinterve
随机试题
______thattheymayeventuallyreducetheamountoflabourneededonconstructio
Ihopeyou______allthematerialsIneedfortileclassbeforeIcomeandteac
TheGovernmentisgoingtogivenew"jobsplitting",grantstoemployerswil
某工程合同价为500万元,合同价的60%为可调部分。可调部分,人工费占35%,材
根据货币乘数模型,下面哪个变量是由公众决定的?()A.超额准备金率r B.
我国中原地区某小山丘周围要布置一组住宅群,现有平面示意的A、B、C、D四个场地可
阿卡波糖的降糖作用机制是()A:与胰岛β细胞受体结合,促进胰岛素释放 B:提
下列关于企业所得税税款的减免的表述中错误的是( )。 A.国家重点扶持的高新
患者,男,49岁,腰痛3日,时发时止,小便不畅。B超检查示:肾盂结石,用药宜首选
运输是社会生产过程在()领域内的继续。A.建设 B.流通 C.分配 D.
最新回复
(
0
)