toi co them chut y kien bo sung them cung voi bac **wing khi nhiet do cao nam trong khoang 65 toi 120 do la khoang nhiet do hoat dong li tuong cua kim loai lam viec nen dong co hoat dong em ai it hao mon , nhung dong co nong lam cho khoi luong rieng cua khong khi hay hoa khi(tuy theo loai xe)...