[单选] 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? （）

国家对医疗器械不良事件实行（）、定期报告制度，必要时可以（）。 试述竞争与合作的积极作用和消极作用。 Certkiller.COM有一组顾问。所有顾问都属于一个全局组命名TempWorkers。你应放置在一个新的组织单位Secureserv的3个文件服务器。这些文件服务器中共享文件夹中的机密数据。放置文件服务器后，你需要记录任何失败的顾问试图访问机密数据。你应该执行以下两个动作来实现这一任务呢（） 对每个共享文件夹的三个文件服务器上，TempWorkers全局组添加到“审核”选项卡。在审核项目“对话框中的配置失败的完全控制设置。。 创建一个新的GPO链接到SecureServ组织单位。配置到这台计算机“拒绝从网络用户设置权限TempWorkers全局组的访问。。 对每个共享文件夹上的三个文件服务器，三台服务器添加到“审核”选项卡。在审核项目“对话框中的配置失败的完全控制设置。。 创建一个新的GPO链接到SecureServ组织单位。配置审核特权使用失败审核策略设置。。 创建一个新的GPO链接到SecureServ组织单位。配置审核 对象访问失败审核策略设置。。 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。 Your company has Active Directory Certificate Services （AD CS） and Network Access Protection （NAP） deployed on the network.You need to ensure that NAP policies are enforced on portable computers that use a wireless connection to access the network.  What should you do？（） Configure all access points to use 802.1X authentication.。 Configure all portable computers to use MS-CHAP v2 authentication.。 Use the Group Policy Management Console to access the wireless Group Policy settings， and enable the Prevent connections to ad-hoc networks option.。 Use the Group Policy Management Console to access the wireless Group Policy settings， and disable the Prevent connections to infrastructure networks option.。 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? （）