1·White plastic PVC plumbing has yellowed and thinned on the side exposed to the light, where its chloride is weathering to hydrochloric acid, dissolving itself and its polyvinyl partners.
白色的热塑树脂的水管装置，照到阳光的那一边已经发黄、变薄，其中含有的氯化物已经风化成为氢氯酸，溶解自身的同时也殃及周边的聚乙烯材料。
2·Deepening study was carried out of the synthesis of polyvinyl formal, its reaction law was summed up and optimum technological conditions were presented.
深入研究了聚乙烯酸缩甲醛的合成工艺，归纳了反应规律，提出了最佳工艺条件。
3·The results of experiments and inspections Showed that many-sided influences emerged in the holographic performance properties of dichromated gelatin when the polyvinyl alcohol was incorporated.
实验与检测的结果表明，将适量的聚乙烯酸掺入重铬酸盐明胶，并相应地改变胶液的配方，对重铬酸盐明胶的全息性能产生了多方面的影响。
4·It is the monomer from which polychloro(ethene) (formerly polyvinyl chloride or PVC) is made.
这是制备聚氯乙烯（以前称为聚乙烯基氯或PVC）的单体。
5·The company has imported advanced equipment and can produce 200-litre annular barrel by using high density polyvinyl resin which is of high rigidity and abradability and can bear ambient pressure.
该公司获得专利技术，进口设备、采用具有钢性大，耐磨性及耐环境压力等特点的高密度聚乙烯树脂生产200升环型塑料桶。