按成因和发生时间，将黑龙江省的洪水划分为三种类型：暴雨（降雨）洪水、融雪和雨雪融合洪水、冰凌洪水； 着重论述了暴雨、洪水的时空分布特征以及暴雨洪水的稀遇程度等。
On the basis of genetic analysis and flood time, the flood in Heilongjiang was divided into three types, that is , storm(rain) flood, snowmelt and rain flood and ice flood in this paper.
再次，按手机用户界面原型构建的目标对象将原型划分为“为自己、为团队成员、为终端用户”三种类别。
Thirdly, it sorts the prototypes by the object of prototyping: for desgigner self, for team and for end user.
按顶体的形态可以划分为十种类型：(1)原生质膜及顶体完好。
The change of acrosomal morphology may be classified into 10 categories: (1) plasma membrane and acrosome intact.
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