首页
登录
职称英语
【B1】 [br] 【B5】 [originaltext] Once regarded as an expensive status symbol, th
【B1】 [br] 【B5】 [originaltext] Once regarded as an expensive status symbol, th
游客
2023-08-01
48
管理
问题
【B1】 [br] 【B5】
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
permanently
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2889394.html
相关试题推荐
【B1】[br]【B11】[originaltext]Iamamazedatsomeofthestatementsconcerni
【B1】[br]【B5】[originaltext]Iamamazedatsomeofthestatementsconcernin
【B1】[br]【B4】[originaltext]Iamamazedatsomeofthestatementsconcernin
【B1】[br]【B2】[originaltext]Iamamazedatsomeofthestatementsconcernin
[originaltext]GeographyasasubjecthasbeentaughtatIllinoisStateUniv
[originaltext]GeographyasasubjecthasbeentaughtatIllinoisStateUniv
[originaltext]GeographyasasubjecthasbeentaughtatIllinoisStateUniv
[originaltext]Americansoftensaythatthereareonlytwothingsapersonc
[originaltext]Americansoftensaythatthereareonlytwothingsapersonc
[originaltext]M:Oh,Ijustgotsomebadnewstoday.W:Whathappened,Tony?M:
随机试题
Whohastakenstepstoresolvetheconflict?[originaltext]U.N.SecurityC
当可燃气体报警控制器有可燃气体报警信号、故障报警信号、屏蔽信号输入时,应向消防控
A.地西泮 B.硫喷妥钠 C.琥珀胆碱 D.哌替啶 E.肾上腺素治疗局麻
内部管理不良预警系统包括( )。A.质量管理预警 B.技术变化预警 C.设
感冒夹惊证的治疗应该在疏风解表基础上加用的方剂是()A.镇惊丸 B.保和
患者女,42岁。反复大量呕吐4天,尿少,伴恶心,乏力。查体:脉搏126次/分,血
商流费用包括()。A:市场分析费用 B:商品销售费用 C:谈判签订契约费用
关于评标委员会的表述,正确的是()。A.评标委员会成员的名单应当保密 B
填筑排水砂垫层施工前施工单位应做压实工艺性试验,确定主要工艺参数,并报()确认
《安全生产许可证条例》规定,除中央管理的建筑施工企业外,建筑施工企业安全生产许可
最新回复
(
0
)