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
24
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 passage provides information that would answer which of the following questions?
选项
A、What are some of the structural and chemical properties that nanotechnologists strive to create when they mold molecules?
B、Why are the techniques of scanning probe microscopy necessary to the production of objects and molecule arrays in the top-down method?
C、Which is more important to the future of nanotechnology, scientists’ use of the theoretical principles or practical experience?
D、Has the nanometer scale been considered easier than the angstrom scale for nanotechnologists to work with?
E、For what reasons do bottom-up nanotechnologists prefer to work with three- dimensional chemical systems that cohere according to the rules of chemical interactions?
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3353525.html
相关试题推荐
Certainmessengermoleculesfightdamagetothelungsfromnoxiousairbytellin
AMALGAMATE:A、revitalizeB、stratifyC、segregateD、assembleE、insulateC
Whilechemiststrytoassemblemoleculesusingacombinationoftheor
Whilechemiststrytoassemblemoleculesusingacombinationoftheor
AMALGAMATE:A、revitalizeB、stratifyC、segregateD、assembleE、insulateC
Bodylanguageinvolvesacombinationofmultiplefacial(i)______andvariousp
Bodylanguageinvolvesacombinationofmultiplefacial(i)______andvariousphy
Notevenamicroscopeissufficientlypowerfultoviewthe______moleculesthatc
Eventhoughsixplayershadbeeninjured,thecoachannouncedtotheassembledr
Thecombinationof(i)____and(ii)____inEdmund’sspeechcanbestartling,esp
随机试题
DavidLandes,authorofTheWealthandPovertyofNations:WhySomeAreSoRi
ArecentstudybyGermanresearcherspresentsthepossibilityof"carbonfa
信息时代informationage
开关在断开电路时,无须考虑电弧熄灭与否。()
下列关于外煤仓布置的说法错误的是()。A.锅炉烟道较长,灰沟引出不便 B.
下列关于沪港股票市场交易互联互通机制试点有关税收政策的理解,不正确的有()。A
挥发油中含白木香酸及白木香醛,来源于瑞香科植物的药材是A.鸡血藤B.沉香C.大血
患者,男性,66岁,因急性广泛前壁心肌梗死急诊入院,入院后经扩冠抗凝治疗,目前胸
关于买卖合同中标的物的瑕疵担保责任,下列表述错误的是哪一个?A.买受人在合理期限
支架现浇箱梁施工中,预应力筋的下料长度要通过计算确定,计算时应考虑的因素有(
最新回复
(
0
)