Fault tree model is the graphical expression of connection of basic events which result in system fault, and used in qualitative and quantitative analysis of system fault model.
故障树模型是导致系统失效的基本事件之间逻辑关系的图形表示，应用于系统失效模型的定性和定量分析。
2
This is the theoretical expression for the resistivity, and it is in qualitative agreement with experiment.
这就是电阻率的理论表达式，它与实验定性地符合。
3
The modeling rules and concise expression methods for qualitative algebra equation were introduced.