Inqubo yokuqinisa i-valve yebhola evalwe ngensimbi Incazelo emfushane yokuthi ama-valve ebhola agqashuka kanjani embonini yamavalvu esango?
Inqubo yokuqinisa i-valve yebhola evalwe ngensimbi Incazelo emfushane yokuthi ama-valve ebhola agqashuka kanjani embonini yamavalvu esango? Ezitshalweni zamandla ashisayo, isofthiwe yesistimu yemishini ye-petrochemical, amandla kanye nemboni yamakhemikhali uketshezi olubonakalayo oluphezulu, olunomsizi nengxenye eqinile...
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