Otsitsa ndi makina otumizira omwe amagwiritsidwa ntchito kwambiri pomanga zombo, kusunga madzi, mphamvu, makina opangira uinjiniya, petrochemical, ndi mafakitale ena. Pali mitundu yambiri yochepetsera. Muyenera kumvetsetsa zabwino ndi zovuta zawo musanasankhe yoyenera yomwe ikugwirizana ndi ...
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