Kwi China abavelisi bevalvu: qonda ibali elingemva kolu shishino
Njengesixhobo esiphambili kulawulo lolwelo, iivalvu zisetyenziswa kakhulu kumashishini amaninzi afana nepetroleum, imichiza, ulwakhiwo, kunye nokugcinwa kwamanzi. Nangona kunjalo, kubavelisi be-valve baseTshayina, ibali lenkqubo yokuvelisa ayaziwa kancinci. Oku ku...
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