Hannun hannu suna taka muhimmiyar rawa wajen samar da aikin aiki. Duk da haka, hannaye kuma sassa ne masu sauƙin rauni, suna lissafin kusan kashi 25% na adadin raunin masana'antu. Wuta, matsanancin zafin jiki, wutar lantarki, sinadarai, tasiri, yanke, goga, da cututtuka...
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