Ⅱ Mine samun iska A cikin karkashin kasa, saboda aikin hakar ma'adinai da iskar shaka ma'adinai da sauran dalilai, abun da ke ciki na iska zai canza, yafi bayyana a matsayin raguwar iskar oxygen, haɓakar iskar gas mai guba da cutarwa, haɗuwa da ƙurar ma'adinai, zazzabi, zafi, canjin matsa lamba. etc. Wadannan chan...
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