以下关于趋势线和通道的说法正确的有( )

下列关于“国有资产无偿划转、变更、合并”中的“无偿”具体理解正确的是( )

根据记账凭证登账,误将200元记为1 000元,应采用( )进行更正。

下列各项中;应填列在利润表"营业收入"项目的有( )

根据以下资料，回答以下题。 　　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 Shot Spotter, The police began using the Shot Spotter in 1995．They wanted to cut down on gunfire in their city.
　　One Shot Spotter 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 Shot Spotter really works well．It locates the gunfire within 20 to 40 feet plus or minus．Redwood City police are very happy with the Shot Spotter．They think it might have helped catch the D.C．sniper.
　　Shot Spotters cost a lot of money．One of them sells for $200,000．Despite the cost, Shot Spotters can be a big help in fighting crime.