题目内容

规模最大，历时最长，影响最为深远的物质循环是（）

A. 水循环
B. 大气循环
C. 地质循环
D. 生物循环

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You have an Exchange organization.All servers in the organization have Exchange Server 2010 Service Pack 1 （SP1） installed. The organization contains a database availability group （DAG） named DAG1.DAG1 contains two Mailbox servers named Server1 and Server2.Five mailbox databases are replicated in DAG1.You need to install Exchange rollup updates on Server1.The solution must not prevent users from accessing their mailboxes. What should you do first？（）

A. Run the Set-DatabaseAvailabilityGroup cmdlet， and then enable Datacenter Activation Coordination for DAG1.
B. Run the Set-MailboxDatabase cmdlet， and then configure all mailbox database copies as lagged copies.
C. Run the Suspend-MailboxDatabaseCopy cmdlet， and then switch over all mailbox databases to Server2.
D. Run the Update-MailboxDatabaseCopy cmdlet， and then modify the mailbox database Activation preference.

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