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  Q:消防水箱高水位74m;高楼最高一层地上标高62m,供水管网和部分水头丢失7.4m,消防水池最低水位-6.6m已知:Sk=10m时,Hxh=15.6m,Sk=13m时,Hxh=21.9m,问消防专用水泵最小扬程()

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