首页
登录
职称英语
【B1】 [br] 【B6】 [originaltext] Once regarded as an expensive status symbol, th
【B1】 [br] 【B6】 [originaltext] Once regarded as an expensive status symbol, th
游客
2024-03-04
56
管理
问题
【B1】 [br] 【B6】
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
portable
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3505655.html
相关试题推荐
【B1】[br]【B11】[originaltext]ThecontinentalUnitedStateswillfacemoree
【B1】[br]【B10】[originaltext]ThecontinentalUnitedStateswillfacemoree
【B1】[br]【B9】[originaltext]ThecontinentalUnitedStateswillfacemoreex
【B1】[br]【B6】[originaltext]ThecontinentalUnitedStateswillfacemoreex
【B1】[br]【B5】[originaltext]ThecontinentalUnitedStateswillfacemoreex
【B1】[br]【B2】[originaltext]ThecontinentalUnitedStateswillfacemoreex
[originaltext]WhenRomeemergedasaworldpower,thedifficultiesofmakin
[originaltext]WhenRomeemergedasaworldpower,thedifficultiesofmakin
[originaltext]Childhoodpovertyhasbothimmediateandlastingnegativeeff
[originaltext]M:Andalittlebitnorthofthereeven,actually,uh,NewHampsh
随机试题
PabloPicassodrewpicturesbeforehecouldtalk.Asachild,hesathappi
EdgarSnowwasareporterandajoumalist.Hewasadoer,aseekeroffacts.
Thehumanbodyisaremarkable(1).Asanadult,youmayconsume(2)foodp
依据YD/T841.3-2016,属于聚氯乙烯(PVC-U)管材物理力学及环境性
下列骨盆测量中,哪项低于正常值A.髂嵴间径28crn B.骶耻外径20cm
《国家电网公司变电运维管理规定》中属于省公司安质部职责的有(____)负责本单位
A. B. C. D.
高良姜与荜茇除温中散寒止痛外,还均兼能A.止呕止泻 B.温助阳气 C.疏肝下
(2020年真题)可增强肝细胞膜的防御能力,起到稳定、保护和修复细胞膜作用的药物
下面关于牙菌斑生物膜的概念理解不正确的是A.整体生存的微生物生态群体 B.凭借
最新回复
(
0
)