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管理信息系统的三大核心技术是网络技术、（）和（）

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竖炉内合理的气流分布和球料运动，与何有关，关键在何？

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水泥环质量的检查方法有声波幅度测井、（）测井和井温测井。

A. 变密度
B. 电法
C. 放射性
D. VSP

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当耐张长度在800m及以下时，一个耐张段内正馈线接头的总数量标准值为（）

A. 0个
B. 1个
C. 2个
D. 4个

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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？（）

A. Increase the tombstone lifetime for the forest.
B. Increase the interval of the garbage collection process for the forest.
Configure daily backups of the Windows Server 2008 R2 domain controller.
D. Enable shadow copies of the drive that contains the Ntds.dit file on the Windows Server 2008 R2 domain controller.

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