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问题:

[单选] 在一个关系R中,若X能够函数决定R中的每个属性,并且X的任何真子集都不能够函数决定R中的每个属性,则称X为关系R的一个()。

A . 候选码
B . 外码
C . 超码
D . 属性组

You are a network administrator for your company. The company has a main office and two branch offices. The branch offices are connected to the main office by T1 lines. The network consists of three Active Directory sites, one for each office. All client computers run either Windows 2000 Professional or Windows XP Professional. Each office has a small data center that contains domain controllers, WINS, DNS, and DHCP servers, all running Windows Server 2003.   Users in all offices connect to a file server in the main office to retrieve critical files. The network team reports that the WAN connections are severely congested during peak business hours. Users report poor file server performance during peak business hours. The design team is concerned that the file server is a single point of failure. The design team requests a plan to alleviate the WAN congestion during business hours and to provide high availability for the file server.   You need to provide a solution that improves file server performance during peak hours and that provides high availability for file services. You need to minimize bandwidth utilization.   What should you do? ()  Purchase two high-end servers and a shared fiber-attached disk array. Implement a file server cluster in the main office by using both new servers and the shared fiber-attached disk array.。  Implement Offline Files on the client computers in the branch offices by using Synchronization Manager. Schedule synchronization to occur during off-peak hours.。  Implement a stand-alone Distributed File System (DFS) root in the main office. Implement copies of shared folders for the branch offices. Schedule replication of shared folders to occur during off-peak hours by using scheduled tasks.。  Implement a domain Distributed File System (DFS) root in the main office. Implement DFS replicas for the branch offices. Schedule replication to occur during off-peak hours.。 高碳钢 You work as the IT professional in an international company which is named Wiikigo. You are experiencedin implementing and administering a network operating system. You are specialized in deploying servers,configuring Windows Server 2008 Terminal services and network application services, and configuring aweb services infrastructure. There is a server which runs Windows Server 2008. You install the Web Server (IIS) server role on this server. You create a Web site named wiikigo.com. You copy an applicationnamed WebContent to the server. You need to enable the WebContent application on the Web site. What action should you perform?() The appcmd add vdir command should be run at the command prompt on the server.。 The appcmd add site command should be run at the command prompt on the server.。 You should choose the Web site from the Internet Information Services (IIS) Manager console. ChooseAdd Virtual Directory.。 You should choose the Web site from the Internet Information Services (IIS) Manager console. ChooseAdd Application.。 试述法医学鉴定程序? Your company has a main office in New York and branch offices in Chicago and Los Angeles. You plan to use Microsoft Application Virtualization (App-V) 4.5 with SP1.  You install an Application Virtualization Management Server in the New York office. You need to provide application virtualization with active upgrade support in the Chicago and Los Angeles offices. You must design your App-V solution so that it minimizes WAN traffic.  What should you do?() Install Application Virtualization Streaming Servers in the Chicago and Los Angeles offices。 Install Application Virtualization Management Servers in the Chicago and Los Angeles offices。 Install the Application Virtualization \CONTENT folder on file shares in the Chicago and Los Angeles offices。 Install the Application Virtualization \CONTENT folder on IIS 7 servers in the Chicago and Los Angeles office。 在一个关系R中,若X能够函数决定R中的每个属性,并且X的任何真子集都不能够函数决定R中的每个属性,则称X为关系R的一个()。
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