招聘成本评估是鉴定（）的一个重要指标，如果成本低，录用人员质量高，就意味着招聘效率高，反之，则意味着招聘效率低。
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You have an Exchange Server 2010 Mailbox server.You need to ensure that deleted mailboxes are kept for 60 days.What should you do？（）
A. Create a Retention Policy.
B. Create a managed folder mailbox policy.
C. Modify the properties of the mailbox database.
D. Modify the properties of the Mailbox server object.
顺序执行PUSH EAX和POPEBX两条指令，其功能等同于（）
A. MOV EAX, EBX
B. MOV EBX, EAX
C. XCHG EAX, EBX
D. XCHG EBX, EAX
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