在关系中能唯一标识元组的最小属性集称为该表的键或码。二维表中可能有若干个键，它们称为该表的（　　）。

A、连接码

B、关系码

C、外码

D、候选码

Which IBM resource should be used to validate the results from a Disk Magic study PRIOR topresenting the final storage solution and pricing to a customer?（）

A、Customer Engineer 

B、Storage Sales Specialist 

C、Competeline Representative 

D、Field Technical Storage Specialist (pre-sales)

Which of the following is the default location for temp files in Windows 7?（）

A、C:///Windows/Temp

B、C:///Windows/SystemFiles/TempFiles

C、C:///SystemFiles/Temp

D、C:///System/TempFiles

Describe the benefits of a virtual tape solution over a native tape solution in a mainframe serverenvironment.（）

A、 the use of physical LTO-5 drives and cartridges for virtualization reduces the overall floor spacerequired for the virtual tape solution 

B、 the virtual tape solution reduces the number of cartridges and physical drives required, andimproves throughput 

C、 the virtual tape solution provides a faster robotic access to virtual cartridges sent to the physicaltape librarywhich guarantees faster accesstimes 

D、 the virtual tape solution provides a larger range of virtual tape drives and automates the backupprocess to physical tape by full synchronousreplication 

Which of the following is the lowest cost enterprise class IBM Storage System that can support anExchange 2010 solution?（）

A、DS5100 

B、Storwize V7000 

C、DS8700 

D、XIV system

Which of the following would be the BEST way to restrict access to the WAP from certain clients?（）

A、Disable DHCP server

B、Enable WEP encryption

C、Disable SSID broadcast

D、Enable MAC filtering