By using the pressure deflection diagram, the flow structure for type 4 shock wave interaction pattern is analysed, and we explains why the surface pressure is very high in this case.

借助于激波极曲线，对第4类激波干扰结构进行了分析，解释了干扰引起物面压力增高的原因。

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Authors design the maintenance processes, compile the operation schedule by Gantt chart and network diagram and analyze the schedule by deflection analysis method.

作者对检修过程进行流程设计，提出利用甘特图、网络图编制进度安排，利用偏差分析法对进度进行分析。

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