Kodi chingwe choteteza chilengedwe ndi chiyani ndipo mawonekedwe ake ndi otani?Zingwe zoteteza chilengedwe zimatchula zingwe zomwe zilibe zitsulo zolemera monga lead, cadmium, hexavalent chromium, mercury, ndi zina zotero, zilibe zoletsa moto wa brominated, sizimatulutsa mpweya woipa wa halogen,...
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