管理信息系统的三大核心技术是网络技术、（）和（）
Your network consists of a single Active Directory forest. The forest contains one Active Directory domain. The domain contains eight domain controllers. The domain controllers run Windows Server 2003 Service Pack 2. You upgrade one of the domain controllers to Windows Server 2008 R2. You need to recommend an Active Directory recovery strategy that supports the recovery of deletedobjects. The solution must allow deleted objects to be recovered for up to one year after the date of deletion. What should you recommend？（） ["Increase the tombstone lifetime for the forest.","Increase the interval of the garbage collection process for the forest.","Configure daily backups of the Windows Server 2008 R2 domain controller.","Enable shadow copies of the drive that contains the Ntds.dit file on the Windows Server 2008 R2 domain controller."]
农业在经济发展中的作用是什么？
什么是IP子网，请简述IP子网划分的作用 。
楼梯预制中原材料砂应选择（）。 ["A.细砂 ","B.中砂 ","C.粗砂 ","D.细砂或中砂"]
导水机构安装主要技术要求有哪些？
