1. Mitundu yosiyanasiyana imatha kutsatiridwa mosasamala, yokhala ndi mtundu wowala, womwe umagwiritsidwa ntchito ngati veneer pamitundu yosiyanasiyana yamatabwa ndi matabwa, okhala ndi kuuma kwakukulu, kukana kuvala komanso kukana kutentha kwabwino.2. Kukaniza kwamankhwala ndikokwanira, ndipo kumatha kukana kuphulika kwa ma acid wamba, alkalis, mafuta, mowa ...
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