The proper choice of fault correlation criterion is a critical problem for the Primary Factor Model.
故障相关性准则的正确选取是主因子模型的核心问题。
The Primary Factor Model is a significant progress in the engine state diagnosis (engine fault diagnosis based on fault equation) theory.
主因子模型是发动机状态诊断（基于故障方程的故障诊断）理论的一个新进展。
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