[问答题] 起动机的控制装置有哪些作用？简要说明其工作过程。

创建计算列时应该使用Column的（）属性。 Which three statements are true about database recovery operations？（） ["Damaged or lost data files are restored from backups.","Redo log file entries are used to roll forward the database.","Undo segments are used to roll back any uncommitted transactions.","Transactions that were active when the failure occurred are restarted.","Transactions that were active when the failure occurred are automatically committed during the recover procedure."] 使用（）对象可以实现数据库的相关表功能。 （）、栈和队列都是（）结构，可以在线性表的（）位置插入和删除元素，而栈只能在（）插入和删除元素；对于队列只能在（）插入元素，在（）删除元素。 The client computers in your network run either Windows XP or Windows 7.   All client computers are in a single Active Directory Domain Services （AD DS） organizational unit （OU） named MyClients.  You install Windows Software Update Services （WSUS）.   You create a Group Policy object （GPO） that enables automatic updates from the WSUS server， and you link the GPO to the MyClients OU.   You place all client computers in a targeting group named MyClients.   Testing reveals that a security update that is applicable to both Windows XP and Windows 7 causes a line-of-business application to fail on the Windows XP client computers.    You need to ensure that the application runs on the Windows XP client computers and that the Windows 7 client computers receive the security update.   What should you do？ （） [" Remove the Windows 7 client computers from the MyClients targeting group. Approve the update for installation to the All Computers targeting group."," Remove the Windows XP client computers from the MyClients targeting group. Approve the update for installation to the All Computers targeting group."," Remove the Windows 7 client computers from the MyClients targeting group. Approve the update for installation to the Unassigned Computers targeting group."," Create a targeting group named MyXPClients beneath the MyClients targeting group.  Move the Windows XP client computers to the MyXpClients targeting group.  Approve the update for installation to the MyClients targeting group."] 起动机的控制装置有哪些作用？简要说明其工作过程。