耐久性：一般外保温层和建筑物应同寿命，使用年限也要在几十年以上。
Durability: general insulation layer and the building should be with life, use fixed number of year will in a few years.
从寿命经济学观点出发，讨论了工业炉热风管道最佳保温层厚度的问题。
From the view of life cycle and economics the optimum insulation thickness of hot air pipes in industrial furnaces is discussed.
从寿命经济学观点出发，讨论了工业炉热风管道最佳保温层厚度的问题。
From the view of life cycle and economics the optimum insulation thickness of hot air pipes in industrial furnaces is discussed.
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