Lapho ukhetha into efanelekile yepayipi engenamthungo, izici eziningi ezifana nokwethulwa komkhiqizo, inqubo, ukusebenza, izici, izinzuzo, ukwelashwa kwendawo, njll. kufanele kucatshangelwe. Amapayipi angenamthungo asetshenziswa kakhulu ezimbonini ezifana nowoyela negesi, i-petrochemical kanye ne-au...
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