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
19
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/3353523.html
相关试题推荐
11.Anycombinationofoverworkandstressinevitablyleadsofinsomnia.Manage
LikeJohnMcPhee’sworks,AnnBeattiepainstakinglyassemblesinherworksanin
Whilechemiststrytoassemblemoleculesusingacombinationoftheor
Whilechemiststrytoassemblemoleculesusingacombinationoftheor
Whilechemiststrytoassemblemoleculesusingacombinationoftheor
Whilechemiststrytoassemblemoleculesusingacombinationoftheor
AMALGAMATE:A、revitalizeB、stratifyC、segregateD、assembleE、insulateC
Sometimesthecombinationofseveral(i)______improvementscreatesanoverallimp
Bodylanguageinvolvesacombinationofmultiplefacial(i)______andvariousphy
Thecombinationof(i)____and(ii)____inEdmund’sspeechcanbestartling,esp
随机试题
[originaltext]W:Isitpossibletomakeacomfortablelivingfromarttoday?I
估算建设投资后需编制建设投资估算表,为后期的融资决策提供依据。按概算法分类,建设
以下关于资本的边际效率递减规律的表述正确的是()。A:资本的边际效率是使得预期收
蛋白质的消化酶主要来源于()A.小肠 B.胆囊 C.胃 D.肝脏
下列各项属于集体资产所有权界定范围的有( )。 A.集体所有的土地
()年秋季,中小学阶段各起始年级的学生原则上都将进入新课程。A.1999 B.
对认知结构迁移理论作出重要贡献的心理学家有()。 A.奥苏伯尔B.班杜拉
以下属于创造性思维特征的有()。 A.敏感性B.流畅性 C.灵活性D.
呈扁片状,背部有黄白色或灰绿色斑点散在,足趾底面具吸盘的是A.僵蚕 B.蛤蚧
公司在创立时首先选择的筹资方式是( )。A.融资租赁 B.向银行借款 C.
最新回复
(
0
)