探讨了城市泥石流风险评价的系统方法，该方法包括泥石流扇形地危险区划、城市易损性分析和城市泥石流风险评价三个主要内容。
This paper researches the integrated method of urban debris flow risk assessment. The method involves the debris flow hazard zonation, the urban vulnerability evaluation and the risk assessment.
通过给出振型函数和相应的边界条件，半解析地确定了螺旋管扇形结构的各阶频率和振型。
The frequency and analytic vibration models can be semi analytically calculated by vibration function and boundry condition.
队伍到达开阔地便成扇形摆开阵势。
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