Gabatarwa: A cikin duniyar gasa ta yau, Al'amuran da'ira (PCBs) suna taka muhimmiyar rawa wajen aiki da ayyukan na'urorin lantarki. Don inganta dogaro, karrewa, da aikin PCBs, jiyya na musamman na saman sun zama daidaitaccen aiki. Capel, da ...
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