freeze-up date造句

• Based on the data of ice flood from 1957 to 1983 , the method of topological forecasting of grey theory was applied to study the law of ice condition of inner mongolia reaches of the yellow river , and topological models of ice flood were built , and the freeze - up date and break - up date of the yellow river from 1984 to 2005 were calculated
  摘要本文应用灰色拓扑预测方法，根据1957年- 1983年的实测资料，探讨黄河内蒙古段冰情预报的规律，并建立了冰情预测模型，对1984 ~ 2005年的开河、封河情况进行了预测。