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
2024-03-04
8
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/3505654.html
相关试题推荐
[originaltext]Hello,everyone.Wewilltalkaboutthetechnologytoday.You
[originaltext]Hello,everyone.Wewilltalkaboutthetechnologytoday.You
[originaltext]Goodmorning,everyone.I’mgoingtotalkabouttheenvironme
[originaltext]Moderator:Goodevening,ladiesandgentlemen.It’smygr
[originaltext]Moderator:Goodevening,ladiesandgentlemen.It’smygr
[originaltext]Aswithsomanyotherthingsinlife,exercisemayworkbest
[originaltext]Aswithsomanyotherthingsinlife,exercisemayworkbest
[originaltext]W:Hi,Jim.Whatareyoudoing?M:Oh,hi,Linda.I’mworkingon
[originaltext]W:Hi,Jim.Whatareyoudoing?M:Oh,hi,Linda.I’mworkingon
[originaltext]W:Hi,Jim.Whatareyoudoing?M:Oh,hi,Linda.I’mworkingon
随机试题
Formostpeople,fatisaburden.Itdoesntreallymatterwhereitappears,
在Excel的单元格中,用户不可以输入()。A.数字 B.日期 C.位图
有6个顶点的图G的邻接表如下所示,以下关于图G的叙述中,正确的是()。
A.隔离患者 B.隔离密切接触者 C.开窗通风 D.搞好“三管一灭” E
空腹听诊,可出现振水音的疾病是()A.肝硬化腹水 B.结核性腹膜炎 C
专业出版社从事旅游图、交通图以及时事宣传图出版业务的,经审核同意,由()审核
A图中每一行的第三个图形是由前两个图形求同存异叠加得到的。
某办公楼平面布置如图所示,采用装配式钢筋混凝土楼盖,MU10砖墙承重。纵墙及横墙
在窦房结细胞动作电位,T型钙通道被激活的时相是( )。A.1期 B.2期
以下不属于口腔白色角化病好发部位的是A.硬腭 B.颊 C.唇红 D.口底
最新回复
(
0
)