首页
财务会计
医药卫生
金融经济
考公考编
外语考试
学历提升
职称考试
建筑工程
IT考试
其他
登录
职称考试
下面有3 篇短文,每篇短文后有5 道题。请根据短文内容,为每题确定1 个最佳选项。 Weaving with Light In the S...
下面有3 篇短文,每篇短文后有5 道题。请根据短文内容,为每题确定1 个最佳选项。 Weaving with Light In the S...
admin
2020-12-24
41
问题
下面有3 篇短文,每篇短文后有5 道题。请根据短文内容,为每题确定1 个最佳选项。
Weaving with Light
In the Sierra Madre mountain range of west central Mexico, the native Huichol people live much the way their ancestors did — without electricity. Thafs because ifs too expensive to string power lines to the remote mountain areas where they live. To help support themselves, the Huichol create beautiful artwork. They sell their art in cities hundreds of miles away from their villages. And without electricity — at home or on the road,they can only work during daylight hours. When it gets dark, they must stop whatever they’re doing.
Now, a team of scientists, designers, and architects is using new technologies to provide the Huichol with light after the sun sets. The scientists* technique involves weaving tiny electronic crystals into fabrics that can be made into clothes, bags, or other items.
By collecting the sun’s energy during the day, these lightweight fabrics provide bright white light at night. Their inventors have named the fabrics “ Portable (轻便的) Lights” . Portable Lights have the potential to transform the lives of people without electricity around the world.
At the core of Portable Lights technology are devices called high-brightness lightemitting diodes (高亮度发光二极管), or HB LEDs. These tiny lights appear in digital clocks, televisions, andstreetlights.
LEDs are completely different from the light bulbs (灯泡). Most of those glass bulbs belong to a type called incandescent lights (白炽灯). Inside, electricity heats a metal coil (线圈) to about 2, 200 degrees Celsius. At that temperature,bulbs give off light we can see. Ninety percent of energy produced by incandescent lights, however, is heat — and invisible. With all that wasted energy, bulbs burn out quickly. They are also easily broken.
LEDs, on the other hand, are like tiny pieces of rock made up of molecules (分子) that are arranged in a crystal structure. When an electric current passes through a LED, the crystal structure produces light. Unlike incandescent bulbs, they can produce light of various
colors. Within a LED, the type of molecules and their particular arrangement determine what color is produced.
The central part of the Portable Lights technology is
选项
A glass bulbs.
B HB LEDs.
C digital clocks.
D incandescent lights.
答案
B
解析
文章第四段第一句话提到:At the core ofPortable Lights technology are devices called high-brightness light-emittingdiodes, orHB LEDs. 可知这种移动灯的核心技术是高亮度发光二极管,或简称HBLEDs。答案为B。
转载请注明原文地址:https://ti.zuoweng.com/ti/PJsQKKKQ
相关试题推荐
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。 ADoctorintheHou...
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。 ADoctorintheHou...
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。 ADoctorinthe...
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。
下面的短文后有2项测试任务:(1)第23~26题要求从所给的6个选项中为第1~4段每段选择1个最佳标题;(2)第27~30题要求从所给的6...
下面的短文后有2项测试任务:(1)第23~26题要求从所给的6个选项中为第1~4段每段选择1个最佳标题;(2)第27~30题要求从所给的6...
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。 TheToughGrassth...
随机试题
(85-86题共用题干) 中心线入射被照体时的方向称为摄影方向。
某建设项目为新兴化工产品制造类项目,已列入发改委年度投资立项计划。决定采取公开招
甲建筑施工企业于2012年5月10日变更名称和地址,按照《安全生产许可证条例》的
30岁女性,5天前,因颊面中龋,去龋后银汞合金充填。1天前,觉右侧颊黏膜烧灼感,
劳动争议的()贯穿于劳动争议处理的各个程序。
形成初步印象,对求助者一般心理健康水平进行分析的工作程序包括()。 (A)分
全国银行间市场债券质押式回购业务参与者违反中国人民银行有关金融机构高级管理人员
蝶腭动脉A.穿过棘孔的动脉分支是B.穿过下颌孔的动脉分支是C.穿过眶下孔的动脉分支是D.穿过腭大孔的动脉分支是E.穿过蝶腭孔的动脉分支是
关于预应力后张法的施工工艺,下列说法正确的是()。A.灌浆孔的间距,对预埋金属螺旋管不宜大于40mB.张拉预应力筋时,设计无规定的,构件混凝土的强度不低于设
甲公司适用的所得税税率为25%,采用资产负债表债务法进行所得税核算,按净利润的10%计提盈余公积。甲公司将一栋商业大楼出租给东大公司使用,并一直采用成本模...