You have an SQL query that takes one minute to execute. You use the following code segment to execute the SQL query asynchronously.IAsyncResult ar = cmd.BeginExecuteReader();You need to execute a method named Do Work() that takes one second to run while the SQL query is executing. DoWork() must run as many times as possible while the SQL query is executing. Which code segment should you use? （） ["while（ar.AsyncWaitHandle==null）{DoWork（）；}dr=cmd.EndExecuteReader（ar）；","while（!ar.IsCompleted）{DoWork（）；}dr=cmd.EndExecuteReader（ar）；","while（Thread.CurrentThread.ThreadState==ThreadState.Running）{DoWork（）；}dr=cmd.EndExecuteReader（ar）；","while（!ar.AsyncWaitHandle.WaitOne（））{DoWork（）；}dr=cmd.EndExecuteReader（ar）；"]
刑法学上的犯罪定义与犯罪社会学中的犯罪定义（） ["完全不同","完全相同","没有联系","有一致也有区别"]
Your corporate network has a member server named RAS1 that runs Windows Server 2008. You configure RAS1 to use the Routing and Remote Access Service （RRAS） The companys remote access policy allows members of the Domain Users group to dial in to RAS1. The company issues smart cards to all employees. You need to ensure that smart card users are able to connect to RAS1 by using a dial-up connection. What should you do？（） [" Install the Network Policy Server （NPS） on the RAS1 server"," Create a remote access policy that requires users to authenticate by using SPAP"," Create a remote access policy that requires users to authenticate by using EAP-TLS"," Create a remote access policy that requires users to authenticate by using MS-CHAP v2"]
18个月的婴儿能搭积木6～7块，逐页翻书，用蜡笔乱涂。
关于路由器的描述，错误的是（）。 ["路由器的转发策略称为路由选择","路由器的软件主要由路由器的IOS操作系统组成","路由器是网络的主要瓶颈","路由器的基本功能是路径选择和数据转发"]
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