Amacala ohlelo lokusebenza
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Ukuhlaziywa kwembangela yokwehluleka kwama-valve okuhlunga ensimbi engagqwali
Imbangela yokwehluleka kokuphuka ngemva kwezinyanga ezingu-18 zevalvu yesihlungi sensimbi engagqwali yasebenza izinyanga ezingu-18, futhi ivalve yokuphuka yatholwa futhi yahlaziywa ivalve yokuphuka, izicubu zesigaba segolide, kanye nokwakheka kwamakhemikhali.Imiphumela ibonisa ukuthi indawo eqhekekile ye-valve iyigobolondo...Funda kabanzi
