Pamodzi ndi mfundo zaboma zochepetsera kugwiritsa ntchito pulasitiki, chikhala chiyeso chachikulu kwa kampani yomwe ikugwiritsa ntchito ng'oma ya pulasitiki potengera zinthu zopangira. Monga, madzi a zipatso, manyuchi, vinyo, condensate mkaka, etc. Leni kutengerapo mtengo, ndi ng'oma akonzanso mtengo ndi kutengerapo khalidwe kulimbikitsa kampani t...
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