Relatively simple proof to some important criteria of monotone bounded in mathematics analysis is presented in this essay through some simple and basic facts.

通过几个简单的基本事实，给出了数学分析中重要的单调有界准则的比较简单的证明。

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A systematic mathematics analysis was presented on second-degree price discrimination. On the basis of quantitative analysis, we got some qualitative conclusions.

对二度价格歧视理论进行了系统的数理经济分析，在定量分析的基础上，给出了一些定性的结论。

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When the material is prepared, each pipe is required to draw its developed map by using mathematics analysis, that is, common coordinate method and triangular method.

蜗壳的每一节，在下料时需要绘制展开图，采用数解法进行展开，即常用的坐标法或三角形法。

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