Ikhonkrithi yeyona nto ixhaphakileyo kwisixhobo sokwakha esithwala imithwalo esetyenziswayo namhlanje equlathe isamente, amanzi, iaggregate, iikhemikhali ezongezelelekileyo, kunye nezongezo zeminerali ngenxa yeempawu zayo ezinjengokufikeleleka, ukumelana noxinzelelo oluphezulu, ukusetyenziswa ixesha elide, kwaye kulula ukuyibumba. . Umgangatho wale mathiriyeli, w...
Funda ngokugqithisileyo