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
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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
The following incorrect description of the data flowchart is ( )
A. The data flowchart describes the data connection and processing functions between the various parts of the system
B. The data flow chart is suitable for comprehensive, intuitive and macro description of the information flow of the system
C. Data flowcharts reflect data flow, data processing, and logical data storage
D. The data flowchart reflects the judgment and control conditions of the interrelation between the various parts of the system
Regarding the drawing of data flowcharts, the following description is correct ()
A. For decomposition processing, the input data stream is usually drawn first, and then the output data stream is drawn
B. There is no new data flow in the next layer of the diagram that does not belong to the data flow children in the upper layer diagram
C. Basic processing has no parent and no children
D. It is up to the user to draw
Regarding the data dictionary, which of the following narratives is incorrect is ()
A. The role of a data dictionary is to define each component on a data flowchart
B. Data flowcharts and data dictionaries are the main tools for describing the logical model of the system
C. Data dictionaries can only be written manually
D. Writing a data dictionary should conform to the specification
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