Search History Select to load keywords (subject equals "Polyethylene") AND (subject equals "โพลิเอทิลีน") AND (subject equals "ยาง") AND (subject equals "Copolymers") AND (subject equals "มาลีอิกแอนไฮไดรด์") (subject equals "Methane") AND (subject equals "มีเทน") AND (author equals "Korn Somjit") AND (subject equals "ตัวเร่งปฏิกิริยา")
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