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
61
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
MichaelJacksonisfamousforhis______trotMuhammadAliforhis______.[br]
[originaltext]Let’sfixatimeforournextmeeting.[/originaltext][originalte
______isthemostfamousnovelofFrancisScottFitzgerald?A、TenderIstheNigh
下列关于货物运输保险特点的说法中,不正确的是()。A:保险利益的转移性 B:保
C
洗钱罪是指明知是()的违法所得及其产生的收益,而采用掩饰、隐瞒其来源和性质的方法
审查期货公司或者客户是否透支交易,应当以期货交易所规定的( )为标准。A.结算
对待患者知情同意权的做法中,错误的是A.婴幼儿可以由监护人决定 B.对某些特殊
以下哪些是系统软件()。A、操作系统 B、数据库系统管理系统 C、管理信息系
重大事故应急救援应根据事故的性质、严重程度、事态发展趋势和控制能力实行分级响应机
最新回复
(
0
)