Chifukwa cha chilengedwe chake, chipinda chogwiritsira ntchito chipatala nthawi zambiri chimafuna kuti chitseko cha chipinda chopangira opaleshoni chikhale ndi ntchito za hermeticness, kutsekemera kwa mawu, kuteteza kutentha, kukana kupanikizika, fumbi, kuteteza moto ndi kuteteza ma radiation.Ndi...
Werengani zambiri