Parapet wall is set on top of breakwater and is designed according to the wave basically can not pass over under the sea conditions of a-hundred-year recurrenceperiod.
防波堤顶部设置防浪墙，防浪墙按重现期一百年一遇海况条件基本不越浪设计。
2
The concept of assessment reference period is put forward. The relation among exceeding probability, recurrenceperiod and annual mean incidence of intensity is deduced.
提出评估基准期的概念，推导出烈度的超越概率与重现期、年平均发生率三者间的关系。
3
Single or small amount of multiple condyloma feasible treatment, multiple or large area of condyloma can be treated 2-3 times, generally in the recurrenceperiod of 20 days -3 months.