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co ban nao hoa nghanh cong nghe polyme khong?neu co thi minh cung nhau trao doi tai lieu nhe!ban nao co tai lieu phan pvc ma trung hop nhu tuong khong?minh co rat nhieu tai lieu chuyen nghanh tieng anh ve polymer ban nao can thi mail cho minh qua email:anhvulebkdn@gmail.com