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【单选题】
Suppliers in an industry are most powerful when:A.
there are few substitutes for the products that they sell.
B.
switching costs are low.
C.
companies in the industry threaten to enter the suppliers' industry.
D.
their profitability is significantly affected by the purchases of companies in a particular industry.
E.
they refrain from entering their customers' industry because of lack of resources.
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举一反三
【单选题】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
【单选题】What is OSI Model?
A.
Open System Interconnection Reference model
B.
Output System Interconnection Reference model
C.
Open Service Interconnection Reference model
D.
Open Settings Interconnection Reference model
E.
Sorry, I dont know
【简答题】建立一对多关系时,一对应的表称为( ),而多对应的表称为( )
【单选题】The TCP/IP stack is a complete set of networking protocols. The OSI Model was meant to be a standardized way of connecting devices together. and most protocols have some direct correlation to the OSI ...
A.
physical layer
B.
data link Iayer
C.
application layer
D.
transport layer
【简答题】K m 值是指( )。
【单选题】● 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 (71) layer of the OSI model． (71)
A.
transport
B.
application
C.
network
D.
physical
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