PVC聚氯乙烯,[计] 永久虚电路PVC dispersion聚氯乙烯分散液PVC water hose聚氯乙烯水管PVC plain film聚氯乙烯素色薄膜PVC rigid pipe聚氯乙烯硬水管PVC stabilizer聚氯乙烯稳定剂PVC-pyridine聚氯乙烯-吡啶pvc insulation聚氯乙烯绝缘PVC garbage bag聚氯乙烯垃圾袋PVC work gloves聚氯乙烯工作手套PVC-U profile硬质聚氯乙烯异型材