首页
登录
职称英语
[originaltext] (5) Scientists may have just given hydrogen a squeeze strong
[originaltext] (5) Scientists may have just given hydrogen a squeeze strong
游客
2024-01-30
3
管理
问题
(5) Scientists may have just given hydrogen a squeeze strong enough to turn it into a metal. The important point here is that they "may" have. In fact, some critics strongly dispute the new claim.
(6) Under extremely high pressures hydrogen may become reflective. Researchers at Harvard University in Cambridge, Mass, have just claimed to have seen it. That reflectivity is a key trait of metals. Their feat required compressing hydrogen to 4.9 million times atmospheric pressure.
If correct, this crushing work would end a decades-long search for a material that could have unusual properties, such as superconductivity—the ability to conduct electricity without resistance.
(7) Most superconductors work only at extremely cold temperatures. But some scientists have calculated that metallic hydrogen might prove a relatively high-temperature superconductor. It might have this trait even at room temperature—higher than any other known superconductor. If so, the new discovery would raise hopes that superconducting metallic hydrogen could be used in power lines. That could make transmission of electricity vastly more efficient.
Questions 5 to 7 are based on the news report you have just heard.
5. What is this news report mainly about?
6. How can we make hydrogen become reflective according to the news report?
7. What do we learn about superconductors?
选项
A、Most of them work only at room temperature.
B、Most of them work only at freezing temperature.
C、Most of them work only at extremely cold temperatures.
D、Most of them work only at extremely high temperatures.
答案
C
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3406383.html
相关试题推荐
[originaltext]W:Youlookbettertoday.Howdidyourtestgo?M:Muchbetterth
[originaltext]W:Youlookbettertoday.Howdidyourtestgo?M:Muchbetterth
[originaltext](5)ThedryconditionsinCaliforniaaregoodforpeoplewho
[originaltext](5)ThedryconditionsinCaliforniaaregoodforpeoplewho
[originaltext](5)ThedryconditionsinCaliforniaaregoodforpeoplewho
[originaltext]Haveyoueverbeenafraidtotalkbackwhenyouweretreated
[originaltext]Haveyoueverbeenafraidtotalkbackwhenyouweretreated
[originaltext]Expertsinthefoodindustryarethinkingalotabouttrasht
[originaltext]Expertsinthefoodindustryarethinkingalotabouttrasht
[originaltext]Withtheglobaleconomynowtakingmoreexecutivestofar-awa
随机试题
TimeManagementforCollegeStudentsTimeyouspentinh
针对群体传播的材料包括()A.宣传栏 B.招贴画 C.海报 D.标语和
环境温度低于24℃、湿度低于70%时,使用纺织品材料包装的无菌物品的有效期宜为A
面对激烈的市场竞争形势,某通讯公司决定通过开展QC小组活动提高员工的质量意识,全
下列对泵组式细水雾系统描述正确的()。A.开式系统的泵组系统应设置稳压泵 B
某企业向银行申请短期季节性融资,银行经借款需求分析,发现该企业比以往季节性融资时
下列不属于数据挖掘的方法是( )。A.决策树 B.数据可视化 C.神经网络
某家电企业通过各种市场营销手段,提高了其产品在目前市场上的份额,扩大了产销量,从
具有爆炸危险性的生产区域,通常禁止车辆驶入。但是,在人力难以完成而必须机动车辆进
下列变压器分接的电压比的检查,正确的是()。A.变压器额定分接下电压比允许
最新回复
(
0
)