首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A cheap printed sensor (传感器) could transmit wildfire warnings. Wildfires have recently destroyed the forests across the world, a
A cheap printed sensor (传感器) could transmit wildfire warnings. Wildfires have recently destroyed the forests across the world, a
admin
2022-07-24
63
问题
A cheap printed sensor (传感器) could transmit wildfire warnings. Wildfires have recently destroyed the forests across the world, and their gravity is increasing. Hoping to reduce harm, researchers led by Yapei Wang, a Chinese chemist of Renmin University, say they have developed an inexpensive sensor to detect (监测) such fires earlier with less effort.
Current detection methods rely heavily on human watchfulness, which can delay an effective response. Most wildfires are reported by the general public, and other alarms come from routine foot patrols and watchtower observers. Passing planes and satellites also occasionally spot something, but "the fire first appears on the ground, " Wang says. "When you see the fire from the sky, it is too late. "
The team says its new sensor can be placed near tree trunks’ bases and send a wireless signal to a nearby receiver if there is a quick temperature increase. That heat also powers the sensor itself, without replacing batteries. The team printed the substances onto ordinary paper to create a sensor for just $0.40.
But improving coordination among the different companies involved in firefighting is even more important to deal with, says Graham Kent, an earthquake expert at the University of Nevada, Reno, who was not part of the study. Kent is director of ALERT Wildfire, a network that uses cameras and crowd sourcing to watch for fires in California, Nevada and Oregon. "The whole way that you respond to a fire until it’s put out is like a ballet, " he says. "You’d have to choreograph (设计) it just so, with resources accurately used at the right time and place in the right order from detection to confirmation to assignment to extinguishment (熄灭). Fire detection is just step one. "
Wang says his team’s next steps are to extend the device’s signal range beyond the current 100 meters, which can limit practical use, and to develop a protective shield (防护罩) for it. The transmitter’ s effectiveness, he notes, will also need to be examined in the field ahead.
What does the underlined word "gravity" in paragraph 1 probably mean?
选项
A、Pull.
B、Extinction.
C、Popularity.
D、Seriousness.
答案
D
解析
根据第一段第二句“wildfires have recently destroyed forests across the world…”可知,最近,世界各地的一些地区都遭到了森林大火的破坏,and的后面表示并列或者递进,所以可推断火势越来越严重,gravity意为“严重性”,故选D。
转载请注明原文地址:https://kaotiyun.com/show/hi6D777K
本试题收录于:
公共英语二级笔试题库公共英语(PETS)分类
0
公共英语二级笔试
公共英语(PETS)
相关试题推荐
Severaldaysago,Icameacrossastrangerinthestreetwhostoppedandaskedmedirections.I【C1】________toshowhimthewayt
Severaldaysago,Icameacrossastrangerinthestreetwhostoppedandaskedmedirections.I【C1】________toshowhimthewayt
Severaldaysago,Icameacrossastrangerinthestreetwhostoppedandaskedmedirections.I【C1】________toshowhimthewayt
Severaldaysago,Icameacrossastrangerinthestreetwhostoppedandaskedmedirections.I【C1】________toshowhimthewayt
Whatwillthemanprobablydo?
TheTownofPressureandtheTownofPleasurewereneighborsbuthadnothingincommon.Residentsbuiltwallsto【C1】________
TheTownofPressureandtheTownofPleasurewereneighborsbuthadnothingincommon.Residentsbuiltwallsto【C1】________
TheTownofPressureandtheTownofPleasurewereneighborsbuthadnothingincommon.Residentsbuiltwallsto【C1】________
Accordingtothespeaker,whatwillthecompanydointhenextquarter?
随机试题
对正中神经的叙述,错误的是
男性,42岁,餐后上腹隐痛4年,此次饱餐后突发上腹刀割样剧痛2小时,疼痛很快扩散到全腹。体检:脸色苍白,出冷汗,体温36.5℃,脉搏96次/分,血压110/80mmHg,全腹压痛,反跳痛、肌紧张,以中上腹最明显,肠鸣音消失,白细胞12×109/L,中性粒细
下列关于副交感神经系统的功能特点,其中错误的是
引起腹膜炎的细菌最多见的是
耐火砌体材料按材质高低分为()。
下列人员中,不符合参加导游人员资格考试条件的是()。
自然界有这样一种现象:当一株植物单独生长时,显得矮小、单调,而与众多同类植物一起生长时,则根深叶茂,生机盎然。人们把植物界中这种相互影响、相互促进的现象,称之为“共生效应”。对此效应,谈谈你的看法。
在多种利率并存的条件下起决定作用的利率是()。
设则该幂级数的收敛半径等于_________.
A、多接触B、和平相处C、保持距离D、公平竞争B
最新回复
(
0
)