1. Kuyambitsa kwa Electric Flange Ventilation Butterfly Valve: Magetsi amtundu wamtundu wa butterfly wamtundu wamagetsi ali ndi mawonekedwe ophatikizika, kulemera kwake, kuyika kosavuta, kukana kutulutsa pang'ono, kuthamanga kwakukulu, kumapewa kutengera kwa kutentha kwakukulu, ndipo kumakhala kosavuta kugwira ntchito. Ku s...
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