The "cloak" scientists have invented

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问题 The "cloak" scientists have invented

Scientists have created the first device to render an object invisible in three dimensions. The "cloak" hid an object from detection using light of wavelengths close to those that are visible to humans. Previous devices have been able to hide objects from light traveling in only one direction; viewed from any other angle, the object would remain visible. This is a very early but significant step towards true invisibility cloaks.

选项 A、can keep an object invisible in three dimensions.
B、can hide an object from detection only in one direction.
C、is a true invisibility cloak.
D、is just a minor achievement.

答案A

解析

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专业英语四级

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The "cloak" scientists have invented

专业英语四级

Anothernatural______thatcontributestothewelfareofthecountryiswater.

Somepeoplearefriendlydrunks,whereasothersarehostile,potentiallyposingadangertothemselvesandothers.Thedifferenc

ExperiencedobserversonAmericancampuseshavebeguntonoticeanewgroupofmothersandfathersemergingoverthepasttwoye

Althoughmostpeoplereturnfrompackageholidaysreasonablysatisfied,thisisnotalwaysthe(1)_____.Take,forinstance,the

Alandfreefromdestruction,pluswealth,naturalresources,andlaborsupply—allthesewereimportant(1)_____inhelpingEngla

Thedifferencesbetweenmenandwomen(1)_____whytheyhavedifferentexpectationsaboutcommunicationinmarriage.Forwomen,

Whichofthefollowingsentencesisasubjunctivemood?

There______nothingmorefordiscussion,themeetingcametoanendhalfanhourearlier.[2000]

Thedoctorisfeelingthelittlegirl’spulse.Hesaysit______normal.

InsomepartsofChinawherewatershortageisverysevere,peoplehaveabathonceinabluemoon.Theunderlinedphraseprobab

交易系统的组成部分有()。Ⅰ．交易主机Ⅱ．交易大厅Ⅲ．报盘系统Ⅳ．交易单元

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甲公司发生的下列非关联方交换中，属于非货币性资产交换的有()。

(2015·河南)运用谈话法和自学法的前提是学生必须有一定的知识基础。()

成文法和不成文法的分类标准是()。

甲、乙签订货运合同，但甲并没有按照约定告知对方有两件货物破损的事实，则甲的行为违反了()。

中国革命胜利的原因有

若x＞－1，证明：当0＜α＜1时，有(1+x)α＜1+αx；当α＜0或α＞1时，有(1+x)α＞1+αx．

A.littleB.unansweredC.detectD.inevitablyE.deepF.dropG.uselessH.