Proposes an optimum mathematical model of heating systems with a minimum life cycle cost being the programming object.

建立了以寿命周期费用最小为目标的供热系统优化规划数学模型。

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Chapter IV is about the social security issues for towns vulnerable groups, including the minimum life security, medical security, unemployment security, housing and educational security.

第四章分析了城镇弱势群体的有关社会保障问题，包括最低生活保障、医疗保障、失业保障、住房及教育保障。

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Chapter IV is about the social security issues for towns vulnerable groups, including the minimum life security, medical security, unemployment security, housing and educational security.

第四章分析了城镇弱势群体的有关社会保障问题，包括最低生活保障、医疗保障、失业保障、住房及教育保障。

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