单项选择题

______ is not the tool name for quality controlling used in the figure below.

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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
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
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