Cov khoom siv of elevator yog ib hom kev siv tshuab txawb nrog cov khoom siv ruaj ruaj. Nws yog tsuas yog tsim nyog rau kev nruam ntsug nqa ntawm powdery, pob zeb thiab cov ntawv me me. Nws tuaj yeem siv dav hauv cov tshuab mills, hmoov nplej mills, nplej mills thiab roj mills ntawm ntau qhov ntau thiab tsawg. , Cov hmoov txhuv nplej siab rau cov chaw tsim khoom, khaws cia khoom ntim ntawm cov chaw cia khoom loj, chaw nres nkoj thiab chaw xaus.
