聚氯乙烯，英文简称PVC，是氯乙烯单体在过氧化物、偶氮化合物等引发剂；或在光、热作用下按自由基聚合反应机理聚合而成的聚合物。氯乙烯均聚物和氯乙烯共聚物统称之为氯乙烯树脂。

Double-height ceilings are the architectural equivalent of shoulder pads. They’re big, exaggerated and were popular in the 1980s. They’re also on the rise again, making small rooms seem larger and ...