VAUSE: Air China admits there was an incident with Flight 981 but blames the control tower.
国航承认981航班的这件事是个事故，但国航指责塔台。
The new forecast analysis method on the flight accident-rate and the flight incident-rate is discussed by using the forecast method based on grey control principle.
基于灰色预测理论，给出了飞行事故率和事故症候率预测分析的新方法。
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