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为什么要保持视图状态？ASP.NET中是如何保持视图状态？

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擦身体的这些护肤品应该选择什么样的？

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职业计划不受职业生涯方案和其他因素的影响，但会受到员工个人因素，如对成就感和对投身职业生涯的需要等的影响。

A. 正确
B. 错误

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You have an Exchange Server 2010 organization. Your company’s compliance policy states the following： .Delete e-mail messages sent to legal department users that are older than 180 days. .Delete e-mail messages sent to all other users that are older than 60 days You need to recommend a solution that meets the requirements of the compliance policy. What should you recommend？（）

A. Configure deleted item retention for all users.
B. Configure Personal Archives for the legal department users.
Create two Managed Folder mailbox policies. Use one policy for the legal department users. Use the other policy for all other users.
D. Create two new message classifications. Use one message classification for the e-mails sent to legal department users. Use the other message classification for the e-mails sent to all other users.

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有一灯泡接在220V的直流电源上，此时电灯的电阻为44欧姆，则通过灯泡的电流是（）安培。

A. 1.5
B. 1.75
C. 2
D. 5

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