You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. You create a custom control named Wheel. You need to ensure that the Speed property of Wheel can be animated. What should you do?（） [" Inherit the DependencyObject class."," Declare the Speed property as a dependency property."," Declare an animation of the Speed property from within the code-behind file."," Implement the System.Windows.Media.Animation.IAnimatable interface with the Wheel class."]
You need to design an authentication strategy for users of portable computers. Your solution must meet business requirements. What should you do？（） ["Issue smart cards and smart card readers to all portable computer users. Configure the domain to require smart cards for login and to log off users who remote their smart cards","Configure the portable computers to connect to only wireless networks that use Wired Equivalent Privacy （WEP）. Install digital certificates on all portable computers","Install computer certificates on all portable computers. Configure all portable computers to respond to requests for IPSec encryption","Install biometric authentication devices on all portable computers. Configure the Default Domain Policy GPO to require complex passwords for all user"]
Your network contains an Active Directory domain controller named DC1. DDC1 runs Windows Server 2008 R2. You need to defragment the Active Directory database on DC1. The solution must minimize downtime on DC1. What should you do first（） ["At the command prompt， run net stop ntds.","At the command prompt， run net stop netlogon.","Restart DC1 in Safe Mode.","Restart DC1 in Directory Services Restore Mode （DSRM）."]
呼叫中心对外面向用户，对内与整个企业相联系，是企业的（） ["支出中心","收入中心","数据中心","计算中心"]
预先危险性分析是在一个工程项目的设计、施工和投产之前，对系统存在的危险性类别、出现条件、导致事故的后果等做出概略的分析。这种分析方法将系统的危险和危害划分为（）个等级． ["4","5","6","7"]
点位图：可以逼真表现自然界的（），由许多的像素点组成，但数据量相对较大，在放大、缩小或旋转时（）产生失真。
