Idan ba a fitar da iskar gas daga karfe kafin murfin foda, matsaloli kamar kumbura, kumfa, da ramuka na iya faruwa.A cikin duniyar kayan kwalliyar foda, simintin ƙarfe kamar ƙarfe, ƙarfe, da aluminium ba koyaushe suke jurewa ba.Wadannan karafa suna tarko aljihun gas na iskar gas, iska da sauran gurbatattun...
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