Saboda keɓancewar yanayin aikin injin da yanayin aiki, matakin rufewa na iska yana da mahimmanci. Misali, injina masu matakan rufewa daban-daban suna amfani da wayoyi na lantarki, kayan hana ruwa, wayoyin gubar, fanfo, bearings, maiko da sauran tabarma...
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