Through the analysis on the materials of monitoring water quality of Xihu Lake in Dali fron 1991 to 1995, the article makes a study on the changing trend of its water quality.
通过对1991 ~ 1995年大理州西湖水质监测资料的分析，研究了西湖水质现状及其变化趋势。
Intuitive analysis and variance analysis are used to get the changing trend of the work-to-break and the optimum parameters. And then the tensile mechanism of the paper making felt is discussed.
运用直观分析法和方差分析法得出了断裂功的变化趋势及最优参数，并对造纸毛毯的拉伸机理进行了探讨。
On the basis of analysis of the changing trend of the product price, some personal views about how to sensibly define the value of mining property was put forward for discussion in the mining sector.
在分析产品价格变动趋势的基础上，对如何合理确定采矿权价值提出个人观点，与矿业同仁研讨。
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