Nau'in na gargajiya na gargajiya (ko rabin-karkashin kasa) tashar famfo ruwan najasa muhimmin wuri ne na magudanar ruwa na tsarin magudanar ruwa na birni.Saboda girman wurinsa, rashin kyawun yanayin aiki, yawan hayaniya, da tsadar aiki, aikace-aikacensa na...
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