Valve ndi gawo lowongolera la njira yoperekera madzimadzi, yokhala ndi kudula, kuwongolera, kupatutsidwa, kupewa kuthamangitsidwa, kuwongolera kupanikizika, shunt kapena kusefukira kwamphamvu yopumira ndi ntchito zina.Kugawika kwa ntchito ndi kugwiritsa ntchito kuli motere: ...
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