Moni nonse, tabwerera kuntchito ndipo zonse zabwerera mwakale,kupanga kukupitilira.
Popeza takonza zopangira tchuthi chisanachitike, tsopano titha kuthamanga mpaka 3000pc mkati mwa mwezi uno.
Titha kupereka mokhazikika komanso mosavuta mafani axial, mafani a centrifugal ngati mukufuna tsopano.
Nthawi yotumiza: Mar-02-2021