A fagen fasahar ganowa, babban diamita na bututun ƙarfe mara nauyi yana nufin diamita mafi girma fiye da 160 mm.Babban diamita sumul karfe bututu yana da muhimmanci abu na man fetur, sinadaran, thermal, tukunyar jirgi, inji, da kuma na'ura mai aiki da karfin ruwa masana'antu, da dai sauransu Tare da ci gaban tattalin arzikin kasa, o ...
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