给出故障可诊断性评价的定义，并针对两种传感器配置情况，进行可诊断性分析。本文所提方法为设计阶段开展故障诊断的研究提供了借鉴和参考。

For the two cases of sensor placement, some related definitions are given, and the fault diagnosabilitys are evaluated. The proposed methods give a valuable reference to the fault diagnosis research.

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