Haum rau kev siv hauv Iia, Iib, iic tawg cov roj kev phom sij1 thiab thaj chaw2.Combustible hmoov av iiia, IIib, cheeb tsam IIIC 21 thiab Thaj 22Ex-Mark:Qhia DB iic T * GB, Ex TB IIic T * DB.