Zindikirani: M’dziko laukadaulo lomwe likusintha nthawi zonse, ma board osindikizira (PCBs) ndiwo msana wa zida zamagetsi zosawerengeka. Kwa zaka zambiri, kufunikira kwa ma PCB ang'onoang'ono, othamanga, komanso ogwira ntchito bwino kwawonjezeka, zomwe zachititsa kuti kafukufuku ndi chitukuko chiwonjezeke (R&D) komanso zosowa zatsopano ...
Werengani zambiri