Yini enquma ubude bempilo yesevisi yophawu lwamafutha?Okokuqala, izinga eliphansi le-oil seal ngokwayo liyisizathu esiyinhloko, uma nje ukulondoloza izindleko zesondlo, esikhundleni esishibhile futhi ikhwalithi ayikwazi ukuqinisekisa uphawu lwamafutha, kulokhu ukushintshwa njalo kwe-oil seal akunakugwenywa, .. .
Funda kabanzi