Ɗaya daga cikin ainihin abubuwan da ake amfani da su na kayan aikin inji da na'ura mai juyayi suna taka muhimmiyar rawa wajen aiwatar da kayan aikin na'ura. Ƙunƙarar leda A matsayin maɓalli na kayan aikin injin, aikin mashin ɗin zai yi tasiri kai tsaye ga daidaiton juyawa, saurin gudu, tsauri, hawan zafin jiki, ...
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