The following options ()are the basic symbols of the data flowchart
A. External entities, data processing, data flow, and business processing units
B. External entities, data processing, data streams, and data storage
C. Description of external entities, information delivery processes, data flows, and business processing capabilities
D. External entities, data processing, data streams, and data file archives
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A data flowchart is a tool that describes ()an information system
A. The physical model
B. The logical model
C. Optimize the model
D. The decision model
In a data flowchart, what is not controlled by the system described is ( )
A. Processing capabilities
B. Data storage
C. External entities
D. The data stream
Data flowcharts are drawn using ( )
A. Bottom-up approach
B. Top-down method
C. The method from thin to thick
D. It's all right
Notes for drawing data flowcharts do not include ()
A. The data stream must be processed
B. Top down, layer by layer, to maintain balance
C. Data storage takes into account the media characteristics and technical means of memory
D. Naming should pay attention to the specification
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