季节性分布；
对宝钢水库（原水）与配水池（工业水）中的生物本底，特别是藻类及丝状真菌的季节性分布作了初步研究。
Seasonal distribution of the organism, especially of algae, filamentous fungi in original water and industrial water of thoshan Steel Company was studied in this paper.
试用集中度指标，对清远市1972-1996年发生的计划免疫相应传染病发病资料进行了季节性分布对比分析。
The seasonal distributions of EPI -target infectious diseases in Qingyuan City during 1972 to 1996 were analyzed by centralized indices.
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