首页
登录
职称英语
When was the paintbrush first utilized? [br] [originaltext] An ancient pain
When was the paintbrush first utilized? [br] [originaltext] An ancient pain
游客
2023-11-19
69
管理
问题
When was the paintbrush first utilized? [br]
An ancient paintbrush used by a prehistoric cave artist survives from 30, 000 years ago. But the bristles of the new nanobrushes are made of tiny carbon filaments—thirty billionths of a meter across and a few millionths long. The brush handles they’re attached to are comparatively large—thicker than a human hair! The researchers have taken microscope pictures showing the brushes can be used to sweep up tiny pieces of nanodust on dirty surfaces.
The researchers also used their brushes to paint microstructures; and by coating the hairs with absorbent com- pounds, they could soak poisonous substances from water. If the tiny tools prove robust enough, they could one day find medical uses, or sweeping away unwanted dirt.
选项
A、sweep up tiny pieces of nanodust
B、paint microstructures
C、soak toxins from water
D、find medical uses
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3201382.html
相关试题推荐
Whatisthemaintopicofthisnews?[br][originaltext]Thegovernorsof4
Whatisthemaintopicofthisnews?[originaltext]Thegovernorsof45stat
Whatdoesthispassagemainlydiscuss?[br][originaltext]Thosewhohads
Whatdoesthispassagemainlydiscuss?[br][originaltext]Thosewhohads
WhohasvisitedSudanlastweek?[originaltext]SudaneseoppositionleaderSa
WhatgameswillbemovedtoChinabyNBAin2004?[br][originaltext]Alls
WhatgameswillbemovedtoChinabyNBAin2004?[originaltext]Allstarce
HowmanyrefugeescamefromVietnamsincetheearly1970s?[br][originaltext]
HowmanyrefugeescamefromVietnamsincetheearly1970s?[br][originaltext]
HowmanyrefugeescamefromVietnamsincetheearly1970s?[originaltext]Ab
随机试题
Manycountrieswillnotallowcigaretteadvertisingintheirnewspaperoron
Whensomeoneissickathome,themotherusuallymakesthefirstdiagnosis(诊
下列对尿道下裂矫正术后尿道狭窄的概述中,错误的是A.尿道吻接处狭窄多系瘢痕环形挛
如果(),我们称基差的变化为"走强"。 Ⅰ.基差为正且数值越来越大 Ⅱ.基
在进行税金计算时应根据相关税法和技术方案的具体情况确定相应的()。A、税种 B
Thechangeinthatvillagewasmiraculou
归脾汤中运用宁心安神的药物有A.茯神、酸枣仁、远志、山萸肉 B.茯神、郁李仁、
急淋白血病诱导缓解的化疗方案包括( )。A.VP B.DVP C.DVLP
(2011年真题)为了提高党政基层机构的执政能力,某市市委为200多名后备干部举
关于人民银行常备借贷便利(SLF)的说法,正确的有()。A.又称为短期流动性调
最新回复
(
0
)