从普通排水管系的工作特性出发，分析了硬聚氯乙烯螺旋单立管的工作原理及其优点。
Proceeding with the working character of building drainage system, the principle of PPI is analyzed in the paper.
从普通排水管系的工作特性出发，分析了硬聚氯乙烯螺旋单立管的工作原理及其优点。
Proceeding with the working character of building drainage system, the principle of PPI is analyzed in the paper.
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