首页
登录
职称英语
When was the paintbrush first utilized? [originaltext] An ancient paintbrush
When was the paintbrush first utilized? [originaltext] An ancient paintbrush
游客
2023-11-18
74
管理
问题
When was the paintbrush first utilized?
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 compounds, 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、3,000 years ago.
B、5,000 years ago.
C、In the primitive society.
D、30,000 years ago.
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3197127.html
相关试题推荐
Theaccidentwasreportedtohaveoccurred[br][originaltext]Anaircraftca
Theaccidentwasreportedtohaveoccurred[br][originaltext]Anaircraftca
Themainaimofthespeakeristo[br][originaltext]Alotofpeopledon’t
Themainaimofthespeakeristo[originaltext]Alotofpeopledon’tlike
Whatisthespeaker’sfieldofstudy?[br][originaltext]I’mcurrentlyst
Whatisthespeaker’sfieldofstudy?[br][originaltext]I’mcurrentlyst
Whatistheprofessormainlydiscussing?[originaltext]Good’afternoon,cla
WhydidthewomangotoHongKong?[br][originaltext]M:Hi,Maggie!Haven’tse
WhydidthewomangotoHongKong?[originaltext]M:Hi,Maggie!Haven’tseenyou
WhichisNOTtheRussiangovernment’sactionaftertherescue?[originaltext]
随机试题
[originaltext]W:Howoftendothebusesrun?M:Everyhalfhouronweekdays,bu
Insuranceisthesharingof【C1】______.Nearlyeveryoneisexposed【C2】______r
PASSAGETHREE[br]Whydoestheauthorsaythat"Shaffer’sstorymakesforgreat
利用报刊来传教,对中国进行文化侵略和思想奴化,被看作是打开中国大门的重要手段。第
下述哪项不符合A型肺气肿表现A.桶状胸明显 B.发绀不明显 C.体型多消瘦
Whenateachertellsstudentsthatthew
初生儿血液红细胞数高,其主要原因是A.内分泌功能过强B.叶酸吸收过多C.铁吸收过
下列镇静催眠药中含有三氮唑结构的是A.苯巴比妥B.地西泮C.苯妥英钠D.艾司唑仑
低于成本价销售鲜活商品属于不正当竞争。()
民航机场工程注册建造师执业工程规模标准所涉及单项工程合同额中,不包括设备费的是(
最新回复
(
0
)