When drawing multilevel data flow chart of top—down, the balance between parent chart and son chart must be taken into account,

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问题 When drawing multilevel data flow chart of top—down, the balance between parent chart and son chart must be taken into account, and to pass judgment for the balance of the charts is regularly maintained by(    ).

选项 A、output data
B、data dictionary
C、processing number
D、input data

答案B

解析
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