通过预测事故经济损失和人员伤亡，确定生产矿井的危险性类别和生产单元的危险性分级。

The risk of classification of colliery and grade of operation unit was calculated with prediction of lost money and human casualty in accidents.

youdao

类别或者项别以及次要危险性；

Class or division and the subsidiary risk;

youdao

建立“灰色类别模型”，对古乡沟泥石流进行危险性评价。

The "Grey Class Model" is constructed, and then the danger degree has been assessed on Guxiang gully debris flow.

youdao