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
Seeing Red Means Danger Ahead The color red often means danger-and by paying attention,accidents can be prevented.In the futu
Seeing Red Means Danger Ahead The color red often means danger-and by paying attention,accidents can be prevented.In the futu
admin
2011-01-10
88
问题
Seeing Red Means Danger Ahead
The color red often means danger-and by paying attention,accidents can be prevented.In the future,the color red also may help【51】______danger at construction sites.Thanks to new work by engineers,bridge supports-or【52】______kinds of materials-could one day contain a color-changing material.It will turn red【53】______a structure collapses or falls apart.
The secret【54】______the color-changing material is a particular type of molecule(分子).A molecule is a group of atoms(原子)held together by chemical bonds.Molecules come【55】______all shapes and sizes,and make up【56】______you can see,touch or feel.How a molecule behaves depends on【57】______kinds of atoms it contains,and how they’re held together.
When a polymer(聚合物)containing a color-changing molecule called a mechanophore(机械响应性聚合物)is about to break,it produces a【58】______.When a polymer with mechanophore molecules becomes“injured”or【59】______,one of the mechanophore bonds【60】______and the material turns red.“It’s a really simple detection method,”says Nancy Sottos,one of the scientists who worked on the project.Sottos and her team tested the color-changing polymers in their lab.The test【61】______ proved encouraging.
There is a way to get rid of the red color:light.When a bright light is shone on the mechanophore, the broken bond is fixed-and the red color【62】______.This“self-healing”may be a problem for engineers.They need to use the color-changer in big construction projects that will be【63】______,in sunlight.And sunlight will make the mechanophore’s warning system【64】______.
Sottos and her fellow scientists still have【65】______work to do before the color-changing molecules can be used outside the lab.
选项
A、results
B、rules
C、tools
D、methods
答案
A
解析
此处是说,检测结果令人振奋。故选A。
转载请注明原文地址:https://kaotiyun.com/show/V2Qd777K
本试题收录于:
职称英语理工类C级题库职称英语分类
0
职称英语理工类C级
职称英语
相关试题推荐
U.S.EatsTooMuchSaltPeopleintheUnitedStatesconsumemorethantwicetherecommendedamountofsalt,raisingtheirr
DangersAwaitBabieswithAltitudeWomenwholiveintheworld’shighestcommunitiestendtogivebirthtounderweightbabie
KnowingYourRealPersonalityfromSleepingPositionsEveryonehasgottwopersonalities—theonethatisshowntotheworld
WalkingBarefootCanHelpPreventSomeInjuriesWalkingbarefoothelpstoimprovebalance,postureandpreventcommonfootin
ActiveinOldAgeKeepsPeopleMobilePeopleover70whoaren’tactivearemorelikelytodevelopproblemswalkingorclimbi
ActiveinOldAgeKeepsPeopleMobilePeopleover70whoaren’tactivearemorelikelytodevelopproblemswalkingorclimbi
Thetiesymbolizesallofthefollowingexcept______.WhichofthefollowingisNOTasocialoccasion?
A.BreakthenewsascalmlyaspossibletochildrenB.BreakthenewsatyourownpaceC.Sharethegoodnewswithyourfriends
A.BreakthenewsascalmlyaspossibletochildrenB.BreakthenewsatyourownpaceC.Sharethegoodnewswithyourfriends
Peoplearoundtheglobehittheheightoftheirmiseryanddepressionin(51)age,anewinternationalstudysuggests.The
随机试题
TheSecretofaHappyMarriageThesecretofalongandhappymarriageappearstobenottoexpecttoomuchfromit.USrese
设二维连续型随机变量(X,Y)的分布函数为求(X,Y)的概率密度f(x,y).
患儿,10岁。前牙冷刺激痛数日。检查:右七中切牙近中深龋洞,叩诊无异常,不松动,冷测一过性痛。处理:去腐干净极近髓,敏感。治疗方法是
雄黄明矾
逍遥散、藿香正气散均源于我国历史上第一部中药制剂规范是
计划生育是我国的基本国策。()
已知某土d10=0.02mm,d30=0.25mm,d60=0.35mm,则该土的不均匀系数为()。
某工程建设联合有限公司与某大型设备公司签订了《设备融资租赁合同》,合同。中对租赁设备数量、质量、交付的时间、租金支付的方式等作了约定。该合同应当采用()。
下列票据中,不得背书转让的有( )。
纳税人因特殊情况不能按期缴纳税款的。经省、自治区、直辖市国家税务局、地方税务局批准,可以延期缴纳税款,但是最长不得超过()。
最新回复
(
0
)