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
31
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/Sl9QKKKQ
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。
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
物流网络结构问题就是确定产品从供货点到需求点流动的结构问题。 A.对 B.错
颅脑MRA技术不包括 A.可采用TOF-MRA,PC-MRA及CE-MRA技术
抗铜绿假单胞菌感染的药物是 A.青霉素 B.氨苄西林 C.磺胺甲基异噁唑
神志不清,语无伦次,声高有力,为
在沿排土场与基底接触面的滑坡中,当山坡形排土场的基底倾角较陡,排土场物料本身的抗
下列检查结果符合特发性肺纤维化的有
急性坏死性胰腺炎时,下列哪项检查结果正确? A.血清淀粉酶均升高B.血清脂肪
强调学科本位的课程是()。A.综合课程B.分科课程C.潜在课程D.活动课程
教师热爱学生的作用表现在( )。 ①得到学生及其家长的馈赠 ②爱学生是教育学生的感情基础 ③爱学生是提高教育质量的重要条件 ④爱学生是获...
口服较静脉注射安全性高的抗痛风药物是()A:苯溴马隆B:聚乙二醇尿酸酶C:别嘌醇D:秋水仙碱E:丙磺舒