首页
登录
职称英语
While chemists try to assemble molecules using a combination of theor
While chemists try to assemble molecules using a combination of theor
游客
2024-01-11
3
管理
问题
While chemists try to assemble molecules using a combination of theoretical
principles and practical experience to mold molecules that have desired
structural and chemical properties, nanotechonologists generally seek to make
Line more than a single molecule. They build arrays of identical or complexed
(5) molecules, sometimes on a scale that will transcend the boundaries of the
microscopic and approach the macroscopic, using both top-down and bottom-up
approaches. The first is exemplified by scientists who build objects and
molecular arrays using the techniques of scanning probe microscopy, while the
second is exemplified by investigators who design two-and three-dimensional
(10) chemical systems that cohere according to the rules of chemical interactions.
The top-down approach has exquisite precision, but its disadvantage is its lack
of extensive parallelism; it requires manipulating atoms and molecules
practically one by one, while the bottom-up approach is massively parallel. But
in both cases, scientists are forced to use the difficult nanometer scale, i.e. the
(15) level at which living systems tend to make their structural components, rather
than the angstrom scale of chemistry. [br] Which of the following statements concerning nanotechnology research is most directly suggested in the passage?
选项
A、Nanotechnology research tends to be more focused on the process of building multiple molecules than chemistry research.
B、Nanotechnology research is increasingly less bound to operations on the microscopic level than it once was.
C、The practitioners of nanotechnology tend to be more optimistic than pragmatic in choosing its methodology.
D、Nanotechnology research involves a much greater level of technical knowledge, on the whole, than chemistry research.
E、Nanotechnology research tends to be more concerned at this stage with precision than convenient mass production.
答案
A
解析
转载请注明原文地址:https://www.tihaiku.com/zcyy/3353526.html
相关试题推荐
Whilechemiststrytoassemblemoleculesusingacombinationoftheor
Whilechemiststrytoassemblemoleculesusingacombinationoftheor
Whilechemiststrytoassemblemoleculesusingacombinationoftheor
AMALGAMATE:A、revitalizeB、stratifyC、segregateD、assembleE、insulateC
Bodylanguageinvolvesacombinationofmultiplefacial(i)______andvariousp
Sometimesthecombinationofseveral(i)______improvementscreatesanoverallimp
Notevenamicroscopeissufficientlypowerfultoviewthe______moleculesthatc
Eventhoughsixplayershadbeeninjured,thecoachannouncedtotheassembledr
TheTreesHaveEyesAAnelaboratecombinationof
TheTreesHaveEyesAAnelaboratecombinationof
随机试题
Theterm"qualityoflife"isdifficulttodefine.It【C1】______averywides
煤矿水害防治工作的基础是( )。A.水害预报 B.水害分析 C.水害监查
根据《建设工程工程量清单计价规范》(GB50500-2013)规定,不得作为竞
每克蛋白质能产生能量A.1kcal B.4kcal C.7kcal
A.风邪 B.寒邪 C.湿邪 D.燥邪 E.火邪具有耗气伤津致病特点的邪
绘制中华人民共和国简图,并标示出120°E、110°E、90°E三条经线和30°
某医院一产妇急需剖腹产,主治医师几次联系要求手术,手术室护士均以手术台没有空而被
下列投资控制采取的措施有误的一项是( )。A:组织措施 B:投资措施 C:
若新增智能防误主机不能替代原独立五防主机,则保留原独立五防主机,新增智能防误主机
根据《全国生态环境保护纲要》,跨( )的重要生态功能区,建立国家级生态功能保护
最新回复
(
0
)