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

WhenhisdaughterMarywentoutforhereveningwalkDoctorCochransatforanhouralonemhisoffice.Itbegantogrowdarkan

Manytheoriesconcerningthecausesofjuveniledelinquency(crimescommittedbyyoungpeople)focuseitherontheindividualor

Anothernatural______thatcontributestothewelfareofthecountryiswater.

Jasonisusuallyundertheweather,buthisrobustbrother______.

Atleastsomeoftheweatherextremesbeingseenaroundtheworldareconsequencesofhuman-inducedclimatechangeandcanbeex

Thebanditsdesolatedthecountryside,burningfarmsandcarrying______harvest.

Asthemanagerwasawayonabusinesstrip,Iwasaskedto______theweeklystaffmeeting.[2001]

Theideaofcreatingasystemthatallowstheunderprivilegedtheopportunitytobreakthecycleandachievesomethingispraise

Itwasessentialthattheapplicationforms______backbeforethedeadline.

"Ithappensthathewasinbusiness."Thesentencemeansthat______.

下列不属于现代流通装备的总体发展趋势的是()。

原子结构的最外层电子数最多不超过

下列选项中，哪一作用与阿司匹林引起的反应无关

A．绿萼梅B．南豆根C．破故纸D．潼蒺藜E．七叶一枝花补骨脂的别名是

组织诊断的核心思想主要包括()。

纲要信号图式教学法的突出作用在于()。

( )是公安机关性质的必然要求。

天龙公司与张某因装修合同发生纠纷，在诉讼过程中，双方协商同意调解。法院依法主持双方调解后达成调解协议，以下说法正确的是()。

Youknowyouhavetoread"betweenthelines"togetthemostoutofanything.Iwanttopersuadeyoutodosomethingequallyim

—I’msorryIsteppedoutsideforasmoke.Iwasverytired.—Thereisno______forthiswhileyouareonduty.

(　　)是公安机关性质的必然要求。