Ukusebenza Kwangaphakathi Kwezisetshenziswa Zokubhola: Ukugcina Ukulawula Nokuphepha
Yethula: Ezweni eliyinkimbinkimbi lemishini yokumba, izingxenye eziningi ezibalulekile zisebenza ndawonye ngaphandle komthungo ukuze kuqinisekiswe ukusebenza kahle. Phakathi kwazo, ama-valve adlala indima ebalulekile ekulawuleni ukugeleza koketshezi, ukugcina ingcindezi, ngisho nokulawula isimo esiphuthumayo...
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