Search History Select to load keywords (subject equals "Polyethylene") AND (subject equals "โพลิเอทิลีน") AND (subject equals "ตัวเร่งปฏิกิริยา") AND (subject equals "เฮกเซน") AND (subject equals "โพลิเมอไรเซชัน") AND (subject equals "Hexane") (dateIssued equals "[1996 TO 1999]") AND (subject equals "Ethylene") AND (subject equals "ตัวเร่งปฏิกิริยาซิเกลอร์แนตทา") AND (dateIssued equals "1999") AND (subject equals "Ziegler-Natta catalysts")
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