多媒体教室中，能够真实再现事物外貌特征的教学设备是（） ["视频展示台","录像机","功放","投影机"]
操作系统的基本功能不包括（）。 ["存储管理","系统容错","设备管理","文件管理"]
制作玻晶砖的原料是由（）材料为主。 ["碎玻璃","石灰石","粘土","混凝土"]
要使晶体管有电流放大作用，必须给发射结加正向电压，（）加反向电压。 ["控制结","集电区","基区","集电结"]
Your network consists of a single Active Directory forest. The forest functional level is Windows Server 2008 R2. The forest contains two domains named contoso.com and na.contoso.com. Contoso.com contains a user named User1. Na.contoso.com contains an organizational unit （OU） named Security. You need to give User1 administrative rights so that he can manage Group Policies for the Security OU. You want to achieve this goal while meeting the following requirements： èUser1 must be able to create and configure Group Policies in na.contoso.com. èUser1 must be able to link Group Policies to the Security OU. èUser1 must be granted the least administrative rights necessary to achieve the goal. What should you do？（） ["Add User1 to the Administrators group for na.contoso.com.","Add User1 to the Group Policy Creator Owners group in contoso.com. Modify the permissions on the scurity OU.","Run the Delegation of Control Wizard on the Security OU. In the Group Policy Management Console，modify the permissions of the Group Policy Objects container in the na.contoso.com domain.","Run the Delegation of Control Wizard on na.contoso.com. In the Group Policy Management Console， modify the permissions of the Group Policy Objects container in the contoso.com domain."]
火灾可分为哪四类？
