Ngokuthuthuka okusheshayo kwemboni yensimbi, ukuze kuthuthukiswe izinga lokuphuma kwensimbi, kuthuthukiswe izinga lokusebenzisa kanye nokusebenza kahle kokukhiqizwa kwesigayo esigaywayo, futhi kuncishiswe isibalo sokuvalwa komshini wokugaywa, ama-carbide mill rolls nama-roll rings avele. njengoba izikhathi zidinga,...
Funda kabanzi