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利用分户采暖下供下回异程式系统允许最大不平衡率确定单元立管的平均比摩阻的选取范围及单元入口压力预留值,进而确定建筑入口的压力预留值.“,”In this paper, the average specific frictional head loss was defined with the help of the maximum unbalance rote of the downfeed and direct return riser system, then was the apartment or building''s available pressure.