Ama-valve ebhola avame ukubizwa ngokuthi ama-valve avulekile navaliwe, kodwa ingabe uyazi ngempela?Inomphumela wokuzungezisa amadigri angama-90.Umzimba wepulaki iyindilinga enembobo eyindilinga noma umzila phakathi kwe-eksisi yayo.Ezweni lethu, ama-valve ebhola asetshenziswa kakhulu ekucwengelweni kwamafutha, amapayipi amabanga amade, imboni yamakhemikhali, p...
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