Uhlahlo lwabiwo-mali kunye nohlalutyo lwexabiso lokuthengwa kwevalvu yaseTshayina
Ngophuhliso oluqhubekayo kwintsimi yokwenziwa kwemizi-mveliso, iivalvu njengesixhobo esisetyenziswa ngokuqhelekileyo kwimizi-mveliso, imfuno yayo yemarike iyakhula. Kumashishini amaninzi, iivalvu zisetyenziswa kakhulu kwi-petroleum, ikhemikhali, igesi yendalo, amandla ombane kunye nezinye ...
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