首页
登录
职称英语
【B1】 [br] 【B9】 [originaltext] Once regarded as an expensive status symbol, th
【B1】 [br] 【B9】 [originaltext] Once regarded as an expensive status symbol, th
游客
2023-08-01
39
管理
问题
【B1】 [br] 【B9】
Once regarded as an expensive status symbol, the cellular telephone has become a popular crime-fighting and safety tool for drivers. Every month, people with car phones make 600,000 calls to emergency numbers, reporting not only drunken driving but also such crimes as drug deals, burglaries and car jackings. "They are our eyes and ears," says Dennis Martin, executive director of the National Association of Chiefs of Police.
Some car phones are installed permanently, drawing power from the vehicle’s battery. Others are portable, powered by the car’s cigarette lighter or by an internal, rechargeable battery. But all operate the same way. Dialing a cellular phone sends a radio signal to the telephone company tower covering that geographic area, or cell site. When a driver begins moving out of one cell site, a telephone company computer senses the weakening signal and automatically passes the call to the next tower. With about 13,000 towers in operation, 97 percent of the population lies within range of cellular service. When car phones first appeared, some police officials worried that drivers using them would not pay attention to the road and would get in accidents. In fact, the phones are making the roads safer, particularly against the danger of drunken drivers. And police are now cooperating with initiatives involving cellular phones.
选项
答案
With about 13, 000 towers in operation, 97 percent of the population lies within range of cellular service.
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2889398.html
相关试题推荐
[originaltext]Goodmorning,class.Mytopictodayishowtofeedahungryw
[originaltext]Emotionsareanessentialandinseparablepartofourconscio
[originaltext]Emotionsareanessentialandinseparablepartofourconscio
[originaltext]WhileithaslongbeenapracticeinAsiancountries,manype
[originaltext]WhileithaslongbeenapracticeinAsiancountries,manype
[originaltext]AstudyhasfoundthateducationalTVshowscomewithanadde
[originaltext]AstudyhasfoundthateducationalTVshowscomewithanadde
[originaltext]Thesaying"blindasabat"simplyisn’tcorrect.Thetruthi
[originaltext]M:WithmeinthestudiotodayisMs.JaneLogan,authorofanew
[originaltext]M:WithmeinthestudiotodayisMs.JaneLogan,authorofanew
随机试题
Whatisthenewsitemmainlyabout?[originaltext]Therehasbeenangryprote
[originaltext]M:Goodmorning!HowcanIhelpyou?W:Goodmorning.I’dliketo
Don’tWasteOurOceansA)Fortoolong,marinelifehasb
ThemusicalcomedyOklahoma!didmuchtoexpandthepotentialofthemusicalsta
Thereisnolink,whatsoever,betweentheproducersandusersofmanpowerw
流产的定义,以下哪项正确A.妊娠<20周,胎儿体重<500g B.妊娠<28周
下列各项,不出现胸壁压痛的是()A.肋间神经炎 B.肋骨骨折 C.肋软
“树欲静而风不止”蕴含了怎样的哲学思想?() A.客观事物的存在与发展是不以
根据我国宪法规定,下列不属于民族自治地方的是()。A.自治区 B.自治州 C
A. B. C. D.
最新回复
(
0
)