Waya wachitsulo wamba wayala malata wakuda, waya wachitsulo chagalasi ndi waya wachitsulo, kodi waya wakuda wopaka malati ndi chiyani?Kodi njira yopangira waya yakuda yamalatisi ndi yotani?Kodi amagwiritsidwa ntchito bwanji?Zigawo zazikulu za waya wakuda wothira ndi chitsulo, cobalt, faifi tambala, mkuwa, mpweya, nthaka ndi ...
Werengani zambiri