Ana amfani da bututun hakowa don hakowa mai mahimmanci don sashen nazarin ƙasa, wanda nau'in ɓangaren giciye ne, babu kutuka a kusa da dogon sandar ƙarfe. Bangaren karafa tare da babban bututu don jigilar ruwa, kamar safarar mai, iskar gas, iskar gas, ruwa da wasu daskararru, bututu,...
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