Based on this paper's objective and meaning, the water price system simulation model that is based on the system engineering, water price theory, input-output analysis is presented.

根据本文研究的目的和意义，建立了以系统工程、水价的基本定价理论和投入产出分析为基础的水价系统仿真数学模型。

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The fourth part constructs the model of problem-solving based learning of chemistry, and discusses its meaning, its modeling, its characters, and its teaching and learning strategies.

第四部分是对基于问题解决的化学学习模式的构建，从基于问题解决的化学学习的涵义、模型构建、学科特点、教学策略和学习策略五个方面进行了论述。

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Then the author offers a synthetical model based on sample evaluation combination efficiency and discusses the meaning of this model according to produce function theory.

在此基础上提出了基于样本评价组合有效性的综合模型，并根据生产函数理论讨论了这一模型的意义。

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