Pamene bolodi PCB ndi zingalowe mmatumba mmatumba ndi kutumizidwa pambuyo anayendera chomaliza mankhwala, kwa matabwa mu madongosolo mtanda, ambiri dera gulu opanga kupanga kufufuza zambiri kapena kukonzekera mbali yopuma kwa makasitomala, ndiyeno vakuyumu ma CD ndi kusunga pambuyo gulu lililonse la malamulo. ndi com...
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