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使用多边形套索工具在工作过程中，按（）键可以取消设置的选区，按住（）键可以在水平、45°斜角、垂直方向上设置选区；按住（）键可以切换到套索工具，再按住（）键重新切换回多边形套索工具。

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Your network consists of a single Active Directory domain. The domain contains a server named Server1 that runs Windows Server 2003 Service Pack 2 (SP2). Your company’s security policy states that domain users must be prevented from logging on to Server1 if a domain controller is unavailable. You disconnect Server1 from the network and discover that you can log on to Server1. You need to configure Server1 to comply with the company’s security policy. What should you do on Server1? （）

A. From the local security policy, modify the Security Options.
B. From the local security policy, modify the User Rights Assignment.
C. From Active Directory Users and Computers, modify the properties of the Server1 account.
D. From Active Directory Users and Computers, modify the properties of the Domain Computers group.

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下列材料能用来擦拭应急照明灯具的是()。

A. （A）肥皂水
B. （B）稀料
C. （C）汽油
D. （D）烧碱溶液

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UPS系统在什么情况下采用蓄电池供电方式？

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某企业2011年利润表显示：净利润300万元，所得税l50万元，利息费用50万元，则该企业2011年的已获利息倍数为()。

A. 6
B. 7
C. 8
D. 10

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