单项选择题

Which of the following would require real-time processing______

A．Playing a computer game
B．Executing a program that predicts the state of economy
C．Printing labels
D．Listening the music
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单项选择题
One tool that is useful during both analysis and design is the ______, which is a pictorial representation of the items of information(entities) within the system and the relationships between these pieces of information.
A．data dictionary
B．dataflow diagram
C．use case diagram
D．entity-relationship diagram
单项选择题
The connection between two networks to form an internet is handled by a machine known as a ______.
A．bridge
B．client
C．router
D．switch
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