... nong den nheit do soi .Khi hoa tan trong dd dc tach ra khoi chat hap thu ,chat hap thu dc tai sinh dc dua qua thiet bi gia nhiet 5 de vao thiet bi hap thu54: cau tao thiet bi trich ly loai ... ra ,ton that nhiet lon vi phai thao cua phong ,dieu kien lam viec nang nhoc ,khong dam bao ve sinh ,kho kiem tra qua trinh ,ton that nhiet lon vi nhiet luong cua tac nhan say khong dc su dung...