快乐彩票网邀请码
<tr id='9sLdaR'><strong id='9sLdaR'></strong><small id='9sLdaR'></small><button id='9sLdaR'></button><li id='9sLdaR'><noscript id='9sLdaR'><big id='9sLdaR'></big><dt id='9sLdaR'></dt></noscript></li></tr><ol id='9sLdaR'><option id='9sLdaR'><table id='9sLdaR'><blockquote id='9sLdaR'><tbody id='9sLdaR'></tbody></blockquote></table></option></ol><u id='9sLdaR'></u><kbd id='9sLdaR'><kbd id='9sLdaR'></kbd></kbd>
共聚系列是 C5/C9 共聚石油树脂, 淡黄色颗粒状热塑性固体树脂。由乙烯装置副产的碳五馏分和碳九馏分为原料经聚合反应而成的低分子量↘聚合物。
