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
Sight is not something that reaches out from our eyes. Instead it is the light that travels to our eyes. You see this page, for
Sight is not something that reaches out from our eyes. Instead it is the light that travels to our eyes. You see this page, for
admin
2013-04-22
83
问题
Sight is not something that reaches out from our eyes. Instead it is the light that travels to our eyes. You see this page, for example, because light, reflecting from the sun or an electric light, travels from the paper to your eyes. Sometimes we see light as it comes from a direct source, such as the sun, fire, lighting, or a light bulb. The rest of the time we see light as it is reflected off objects. It must have been a great leap in the intuition of scientists to realize that light actually travels. It isn’t just there! In the air light travels at a speed of 186,000 miles per second. It travels slightly faster in a vacuum and slower in other trans- parent materials such as water or diamonds. It takes light less than one minute to travel from the earth to the moon and about 15 minutes to go from the earth to the sun.
选项
答案
Sight is not something that reaches out from our eyes. Instead it is the light that travels to our eyes. You see this page, for example, because light, reflecting from the sun or an electric light, travels from the paper to your eyes. Sometimes we see light as it comes from a direct source, such as the sun, fire, lighting, or a light bulb. The rest of the time we see light as it is reflected off objects. It must have been a great leap in the intuition of scientists to realize that light actually travels. It isn’t just there! In the air light travels at a speed of 186,000 miles per second. It travels slightly faster in a vacuum and slower in other trans- parent materials such as water or diamonds. It takes light less than one minute to travel from the earth to the moon and about 15 minutes to go from the earth to the sun.
解析
转载请注明原文地址:https://kaotiyun.com/show/aEQK777K
0
专业英语四级
相关试题推荐
Inspiteof"endlesstalkofdifference,"Americansocietyisanamazingmachineforhomogenizingpeople.Thereis"thedemocrat
There’sbeenalotoftalk【C1】______aboutwhoshouldgotocollegeandwhoshouldnot.Andthe【C2】______thathaveguidedthista
Somedayastrangerwillreadyoure-mailwithoutyourpermissionorscanthewebsitesyou’vevisited.Orperhapssomeonewillca
Isthereapopulationproblem?Myanswer【C1】______thequestionis"YES",thereisaproblem.Thescaleofhumanactivitiesisno
ThenumberofwomendirectorsappointedtocorporateboardsintheUnitedStateshasincreaseddramatically,buttheratiooffe
Nomatterhowfrequently______,theworksofBeethovenalwaysattractlargeaudiences.
Sometimes,kidshaveextrachallengesmakingfriends,evenifyou’redoingeverythingfightasaparent.Allchildrenarec
Thelecturermadesuchaboringspeech.ButIwasn’tbotheredbythedullness______byhiscarelessness.
Themeetingwassoprolongedandexhaustingthat______thespeakersstoppedforrefreshments.
Weallleftthemeetingconvincedthattheprojectwas______.
随机试题
婴儿死亡率是衡量一个国家什么水平的敏感指标
下列哪项与羊水过多无关
女,55岁。右上腹痛阵发性加重,伴寒战和皮肤、巩膜黄染2天来诊。查体:T40℃,P120次/分,R23次/分,血压80/60mmHg。躁动、谵妄,右上腹肌紧张,压痛并反跳痛,可触及肿大的胆囊,触痛,肝区叩痛。白细胞计数25×109/L,血小板计数20×1
实施监理的工程项目,某监理公司与建设单位签订了委托监理合同后,建设单位将编制监理规划的有关文件交给监理单位,要求监理单位报送监理规划。监理单位收到有关文件后,总监理工程师派负责合同管理的专业监理工程师组织有关人员进行编制,经监理公司负责人审核批准后,并在第
风险文化的内涵是以企业文化为背景,贯穿以人为本的经营理念,通过由()所构成的整个风险管理体系.把风险管理责任扩散到每个业务部门和每个业务环节。
坚持依法治国,需要发挥法律的作用,反对以德治国,以法治代替德治。()
A、 B、 C、 D、 D本题属于两组同规律类图形推理。观察图形可知,第一组图形三个图形均位于两道平行线之间,且有相连的两块黑色图形。同样,第二组图形均位于封闭图形内部且有相连的两块黑色图形,故选D。
[2003年单选]人的视觉器官有感觉外界物体的光和颜色的功能。可见光的波长范围一般是380nm(纳米)到780nm,称为可见光谱。在可见光谱范围内,不同波长的辐射使人感觉到不同颜色,一股来说,700nm为红色,580nm为黄色,510nm为绿色,470nm
在深度为7的满二叉树中,叶子结点的个数为
AddSpicetoYourLife!LongratedNumberOneintheSouth,BayouSauceistheperfectsaucetospicingupyourfoodandimpress
最新回复
(
0
)