The event has been written about since at least the 1940s, when the word“echolocation” was first invented in a science article titled“Echolocation by Blind Men, Bats, and Radar.”How could blindness give rise to the amazing ability to understand the surroundings with one's ears? The ...
Users tie radar onto their knees and _22 the loudspeaker around their necks. When they meet obstacles, the radar will see them and the loudspeaker will make a _23 to tell the users.Chen Huijuan, an official from Jiangsu Association for Science and Technology, was_24 at these inventions.25...
( )14. Where did Dnald F. Duncan first see the yy? A. In New Yrk.B. In Califrnia. C. In Lndn. ( )15. What shape f the yy was made during the 1950s? A. The beeshaped yy. B. The birdshaped yy. ...
Unit 6 When was it invented (时间:120分钟 分值:120分)一、听力理解(每小题1分,共20分)A)请听下面5段对话。每段对话后有一小题,从题中所给的A、B、C三个选项中选出最佳选项。听完每段对话后,你都将有10秒钟的时间回答有关小题和阅读下一小题。每段对话读两遍。( )1.When were the cars inven...
Scotch tape was invented in 1930 by banjo-playing 3M engineer Richard Drew. Scotch tape was the world's first transparent adhesive tape. Drew also invented the first masking tape in 1925—a 2-inch-wide tan paper tape with a pressure sensitive adhesive backing. In 1923, Drew joined the 3M ...
V.完形填空When talking about inventors, who do you first think of? Forget Thomas Edison. Meet the teenage1 at the 24th Jiangsu Adolescents Science & Technology Innovation Contest(江苏青少年科技创新大赛).Wang Xingyu, from Kunshan No. 2 Middle School,invented “ a _2 line" in the zebr a cro...
He worked on a(n) 6.___to design radar(雷达) sets for the US army. He discovered the power of microwave technology by accident in 1945. This led to his invention of the microwave oven. In 1953, the first microwave oven for home use was developed. But it was very expensive. Then ...
One was carrying 69 passengers from Toronto, the other 176 passengers from Chicago. An air traffic controller noticed on his radar(雷达) screen that the two planes were too close to each other. He ordered one to turn to the right and to climb. But he made a mistake...
Who invented braille first and when?Question:Who invented braille first and when?Braille:Braille is a method of reading and writing that was developed specifically for the blind. It uses a series of raised dots on a paper with different combinations of dots representing different letters or punctu...
While Kotsenburg entered under the radar,Shaun Whitearrived in Sochi with high expectations for a three-peat in halfpipe. But competing in a pipe that was in a less-than-ideal condition, White was unable to put down the run he wanted. After crashing on his first attempt, White couldn't ...