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[国外标准] AWWA C909-2002 给排水用4至12英寸(100至600mm)分子定向聚氯乙烯(PVCO)压力管
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[国外标准] AWWA C900-2007 输水和配水用4英寸~12英寸(100mm~300mm)聚氯乙烯(PVC)压力管和装配配件
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