C2/C3下游需求增加,主要产品聚乙烯/环氧乙烷/聚醚大单体/乙二醇/苯乙烯历史分位 21.76% /13.27% /4.10% /7.43% / 32.03%,产品价差历史分位4.24%/3.36%/0%/0.88%/2.30%。