Ilungu lepayipi elixhumanisa indololwane enodonga oluwugqinsi lihlanganisa indololwane emise okwe-arc, ebonakala ngokuthi kukhona ukuhlukana phakathi koxhumano oluqondile endololwaneni egobile. Izindololwane eziwugqinsi zakhiwe ngensimbi ewugqinsi, insimbi engagqwali, insimbi yengxubevange, insimbi ecijile, i-carbon steel, i-meta engeyona insimbi...
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