在气候处于少雨时期，极端干旱频率远高于多雨时期。
The frequency of extreme drought in the dry period is much higher than that in the wet period.
干旱、洪涝、霜冻、冰雹是山东省最主要的气象灾害，具有频率高、范围广、灾情重等特征。
Drought, flood, frost and hail are major meteorological disasters with the characteristics of high frequency, wide distribution and serious conditions etc. in Shandong Province.
确定了不同程度的干旱在区域上的分布特征及其发生频率。
The distribution and frequencies of drought in different degree were determined.
应用推荐