That's right -- the first cell phone was involved in what some might refer to as a prank call! It would take many more years to build out cellular networks and drive down production costs to make cell phones a viable commercial product. But after more than a century of research and ...
But, Cooper was able to make use of it --- he called a technology business competitor. 但是,库珀能够使用它——他打电话给一个技术业务竞争对手。 Fifty years later, the inventor says he hopes wireless phones can make life better but ...
根据前文“Teenagers who talk on the cellphone a lot, and hold their phones up to their right ears, score worse on one type of memory test.(在一项记忆力测试中,经常打电话并把手机举到右耳旁的青少年得分更低)”以及根据下文“one side effect of the radiation (放射线) ”(放射线副作用)可知,...
Teenagers who talk on the cellphone a lot,and hold their phones up to their right ears,score worse on one type of memory test.That's the finding of a new study.That memory impairment might be one side effect of the radiation(放射线)that phones use to keep us connected while we're on...
cell phones. And they got call records from phone companies. The researchers used those records to figure out how long the teens were using their phones. This allowed the researchers to work out how big a radiation exposure (接触) each person could have got while talking. A phone user's ...
Teenagers who talk on the cell phone a lot, and hold their phones up to their right ears, score worse on one type of memory test. That's the finding of a new study. That memory impairment might be one side effect of the radiation (放射线) that phones use to keep us connected while...
should have cell phones C. had better make more friends 相关知识点: 试题来源: 解析 B 推理判断题。根据第二段中的第一句“Pro.cell phone people。。.cell phones help kids keep in touch with their friends and families."可以推知,他们是指支持孩子拥有手机的人们。 D.may lose touch with others...
Today, the hexagonal cell phones are referred to with the relatively new label of “zero generation phone.” 1G Mobile Phones When Dr. Martin Cooper placed the world’s first cell phone call to Dr. Joel Engel on April 3rd, 1973, the technology used by the device became known as a 1G ...
Phone users can make more money with new networks.C. The cell phone network type has little to do the cell phone use.D. Radiation levels are affected by the cell phone network types.()3. According to the study, what do teens who use their phones close to their right ears a lot do ...
72. Teens who become addicted to their cell phones will become . A. too anxious to relax. B. unable to stay still. C. unable to have real rest. D. excited to forget sleep. 73. What we can learn from the sixth paragraph is that . ...