Yeyiphi ivalve isilawuli? Imela ntoni imodeli nganye kunye neenkcukacha?
Ivalve yokulawula ikwabizwa ngokuba yivalve yolawulo. Kuyo yonke inkqubo yoshishino oluzenzekelayo kushishino, ngokutsho umqondiso data yolawulo ukwamkela uhlengahlengiso imveliso iyunithi yolawulo, ngokutsho ukusebenza yokwenene amandla okuqhuba ukutshintsha ukuhamba iyonke izinto, uxinzelelo ukusebenza, ubushushu, inqanaba ulwelo. isixhobo kunye nezinye iiparitha zobugcisa zamacandelo olawulo lokugqibela, namhlanje sikuthatha ukuba uqonde ukuba yintoni i-valve? Imela ntoni imodeli nganye kunye neenkcukacha?
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