单项选择题

Business intelligence (BI) is the integrated application of data warehouse, data mining and（）.

A.OLAP
B.OLTP
C.MRPⅡ
D.CMS.

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单项选择题
Most of the host operating system provides a way for a system administrator to manually configure the IP information needed by a host. Automated configuration methods, such as（）, are required to solve the problem.

A.IPSec
B.DHCP
C.PPTP
D.SOAP
单项选择题
OSI is a theoretical model that shows how any two different systems can communicate with each other. Router, as a networking device, operate at the（）layer of the OSI model.

A.transport
B.application
C.network
D.physical
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