Akatswiri azachilengedwe a pa Yunivesite ya Perm Polytechnic amathandizira kubwezeretsa dothi lomwe lakhudzidwa ndi mafuta
Akatswiri azachilengedwe a payunivesite ya Perm Polytechnic apanga ukadaulo womwe ungathandize kubwezeretsa chonde kwa dothi loipitsidwa ndi zinthu zamafuta ndi zitsulo zolemera.
