1. Ngokwemathiriyeli, yahlulwe yaziibhola zentsimbi zecarbon ezisezantsi, iibhola zentsimbi zecarbon eziphakathi, iibhola zentsimbi eziphezulu zekhabhoni, ezona zinto ziphambili zi-1010-1015, 1045, 1085, njl .; 2. Ngokutsho kobulukhuni, yahlulwe yaziibhola ezithambileyo kunye neebhola ezilukhuni, okugweba ukuba unyango lobushushu lu ...
Funda ngokugqithisileyo