Kuyesa kwa ma valve kwa nthawi yayitali kumadalira kusamalidwa bwino ndi kusamalira tsiku ndi tsiku
Kuyesa kwa ma valve kwa nthawi yayitali kumadalira kusamalidwa kosamalitsa ndi kusamalira tsiku ndi tsiku Kawirikawiri, ma valve sayesedwa mphamvu, koma matupi okonzedwa ndi zophimba kapena zowonongeka ziyenera kukhala. Kwa ma valve otetezeka, kuthamanga kosalekeza, kuthamanga kwa kubwerera ndi zina ...
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