Abavelisi bevalve yesango abaziwayo: amandla okwakha uphawu
Ngokukhawuleza kwenkqubo yoshishino, ishishini levalvu kuphuhliso loqoqosho lwaseTshayina liya lisiba libaluleke ngakumbi nangakumbi, phakathi apho, ivalve yesango njengesebe elibalulekileyo loshishino lwevalvu, ukusetyenziswa kwayo kumandla, i-petrochemical, amanzi...
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