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由于运八系列飞机上装备的机载设备种类比较多，测试信号复杂，单纯使用一种故障诊断方法很难达到故障诊断与隔离的目的。
There are many kinds of air-borne equipments and the signals to be measured are complex, it is hard to attain the goal of fault diagnosis and isolation just use one method.
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