This article introduces an optimum scheme for economical assessment of pipeline insulation and three models of optimum design.

本文介绍了保温管道经济评估优化设计方案和三个优化设计模型。

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According to the report, fridges and freezers built in recent years contain more plastic than older models, but the highly flammable insulation is not separated from the parts of the appliance where a fire can start.

BBC: Fire warning over 'dangerous modern fridge freezers'