Mfundo zazikuluzikulu zisanu zakuyika ma valve wamba kuyika, kugwiritsa ntchito ndi kukonza ma valve
Mfundo zazikuluzikulu zisanu zoyika ma valve okhazikika, kugwiritsa ntchito ndi kukonza ma valve ambiri akulowera. Mwachitsanzo, valavu yapadziko lonse lapansi, valavu yopumira, valavu yochepetsera kuthamanga, valavu yoyang'ana, ndi zina zotero, ngati itayikidwa kumbuyo, idzakhudza kugwiritsidwa ntchito ...
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