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18. Ukuhlaziywa kokuhlanzeka kwegesi: Isetshenziswa ngokujwayelekile e-welding njengegesi evikelekile kanye nocwaningo lwesayensi.

I-imeyili:


    Inani elikhulu le-oxygen eliwuketshezi ligcinwa ethangini lokugcina lomoya-mpilo.