符号图是用一系列符号标记在图内相应采样点位置上，以代表不同的指标、量值及分布范围的图件。
符号图s是平衡图，如果它的每一个圈都包含偶数条负边。
Asigned graph s is balanced if each of its cycles contains even negative edges.
建立了液压系统的知识库、图形库图形库中存有液压元件符号图及各种常用回路的图形块。
Establishment of a knowledge bank and a diagram bank of the hydraulic system. Component symbol graph and diagrams of commonly-used circuits are stored in the diagram bank.
给出了机理模型与工艺流程符号图动态链接的两种方式：动态链接库热链接和变量连接，并提供了变量定义初步功能。
Two methods of dynamic link between the process mechanism models and the graphs are given, which are DLL hot interlink and variant linkage, and elementary function of variant definition is provided.
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