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
2025-02-22
23
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] The primary purpose of the passage is to
选项
A、indicate some possible technological benefits to the development of new and varied techniques in nanotechnology
B、argue that science involving the macroscopic tends to be exponentially more difficult than the science of the microscopic
C、defend the use of the bottom-up approach of building molecules as more efficient relative to the top-down approach
D、distinguish two different approaches in nanotechnology and comment on their differences and similarities
E、correct the misconception that the benefits of nanotechnology are likely to be seen in the near future
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3968085.html
相关试题推荐
Whilechemiststrytoassemblemoleculesusingacombinationoftheor
Whilechemiststrytoassemblemoleculesusingacombinationoftheor
Whilechemiststrytoassemblemoleculesusingacombinationoftheor
Bodylanguageinvolvesacombinationofmultiplefacial(i)______andvariousp
Sometimesthecombinationofseveral(i)______improvementscreatesanoverallimp
Bodylanguageinvolvesacombinationofmultiplefacial(i)______andvariousphy
Notevenamicroscopeissufficientlypowerfultoviewthe______moleculesthatc
Eventhoughsixplayershadbeeninjured,thecoachannouncedtotheassembledr
TheTreesHaveEyesAAnelaboratecombinationof
TheTreesHaveEyesAAnelaboratecombinationof
随机试题
尽管品格在很大程度上依赖于性情和体魄、家庭教育、早期训练以及伙伴的榜样,每一个人还是有能力通过警醒的、坚持不懈的自制来规范、约束和砥砺他的品格。
TheStockExchangeWhoNeedsthestockExcha
Atattoomaygiveparentsofchildrenwithfoodallergiessomepeaceofmind
下列关于掌深弓的描述中,错误的是()A.往往平腕掌关节高度 B.位于屈指肌
女性,52岁,有胆管结石病史,近2天来右上腹痛,体温37.8℃。2小时前突然畏寒
当事人申请仲裁,应当符合的条件不包括()。A、存在有效的仲裁协议 B、有具体的
与酸枣仁"补肝、宁心"功效相关的药理作用是A.抗惊厥B.降压C.耐缺氧D.降血脂
胸中血瘀,头痛,日久不愈,宜用 A.血府逐瘀汤 B.通窍活血汤
叩诊呈浊音的情况见于A.肺炎 B.大量胸腔积液 C.胸膜肥厚 D.气胸
某施工单位承担一水电站工程项目施工,其中施工单位可以分包的工程项目是( )。A.
最新回复
(
0
)