7
计算由不同材料管道中摩擦引起的压降。
有一系列的钢管(EN 10255:2005),铜(UNE-EN 1057:2007和ASTM-B-88),聚氯乙烯PVC-U(EN ISO 1452-2:2010)和PVC-O(UNE-ISO-ISO-ISO 16422:2008) 15876-2:2004)。December 16, 2025
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