首页
登录
职称英语
【B1】 [br] 【B8】 [originaltext] Once regarded as an expensive status symbol, th
【B1】 [br] 【B8】 [originaltext] Once regarded as an expensive status symbol, th
游客
2023-08-01
33
管理
问题
【B1】 [br] 【B8】
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
operate
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2889397.html
相关试题推荐
[originaltext]Goodmorning,class.Mytopictodayishowtofeedahungryw
[originaltext]Emotionsareanessentialandinseparablepartofourconscio
[originaltext]Emotionsareanessentialandinseparablepartofourconscio
[originaltext]WhileithaslongbeenapracticeinAsiancountries,manype
[originaltext]AstudyhasfoundthateducationalTVshowscomewithanadde
[originaltext]AstudyhasfoundthateducationalTVshowscomewithanadde
[originaltext]AstudyhasfoundthateducationalTVshowscomewithanadde
[originaltext]Thesaying"blindasabat"simplyisn’tcorrect.Thetruthi
[originaltext]Thesaying"blindasabat"simplyisn’tcorrect.Thetruthi
[originaltext]M:WithmeinthestudiotodayisMs.JaneLogan,authorofanew
随机试题
[img]2014m5x/ct_egreqm_egreqjs_0148_20135[/img]Inthefigureabove,RS=STand
Whichcolumnofthebarchartrepresentsthefiguresquoted?[img]ct_ei_034(2009
Theworldhasexperienced【L1】______urbangrowthintherecentdecades.Asmu
可致肾素分泌增多的因素是()A.入球小动脉压降低 B.交感神经活动降低 C.
学校德育对政治、经济、文化发生影响的功能是指( )。 A.发展性功能 B
行为治疗模式的治疗技术主要有()。A.模仿 B.输入希望 C.放松练习 D
下列交通警告标志中,表述正确的是()。A. B. C. D.
约有1/5患者会发生高尿酸血症,严重痛风、消化性溃疡患者禁用的药物是A.烟酸
对关于正中关系的描述正确的是()A.又称正中 B.亦称正中关系 C.亦称牙尖
A.乳糖操纵子(Lacoperon) B.转录因子IID(TFIID) C
最新回复
(
0
)