In Redwood City, police can hear gunfire within ______.A．five secondsB．seven secondsC．seve

In Redwood City, police can hear gunfire within ______.

A．five seconds

B．seven seconds

C．seven minutes

D．thirty seconds

查看答案

如果结果不匹配，请联系老师获取答案

您可能会需要：

重置密码查看订单联系客服

安装优题宝APP，拍照搜题省时又省心！

更多“In Redwood City, police can he…”相关的问题

第1题

It used to take Redwood City, California police hours to locate gunfire. Now, they have a

new tool that helps them find the gunfire quickly. This new tool is called the ShotSpotter. The police began using the ShotSpotter in 1995. They wanted to cut down on gunfire in their city.

One ShotSpotter covers a square mile. Eight microphones are put on the roofs of buildings. These microphones pick up gunfire noise. It only takes seven seconds to report the gunfire to the police. Then a red dot on the police map shows where the action is.

The ShotSpotter really works well. It locates the gunfire within 20 to 40 feet plus or minus. Redwood City police are very happy with the ShotSpotter. They think it might have helped catch the D.C. sniper.

ShotSpotters cost a lot of money. One of them sells for $200,000. Despite the cost, ShotSpotters can be a big help in fighting crime.

Eight microphones placed on rooftops ______.

A．talk to police

B．warn the public

C．listen for gunfire

D．play rap music

点击查看答案

第2题

在DNA的复制延长中具有真正催化作用的酶是（）

A.NA polⅠ

B.NA polⅡ

C.NA polⅢ