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+)Bi trn bnh rng: -B truyn bnh rng trong hp gim tc thng bi trn bng du. Bi trn bng m thng ch dng vi cc b truyn h v c vn tc vng rt thp. - bi trn b truyn bnh rng c th dng phng php ngm du (ph bin nht; dng khi vn tc vng =15m/s) vo
cc con ln: dng khi quay vi vn tc cao. 5. Dng kh nn phun du n cc ; Kh nn va c tc dng phun du va c tc dng lm mt . Phng php ny dng khi vn tc v nhit cao v n khng cho php dng du quay vng nh cc phng php trn.