Da farko, kuna buƙatar fahimtar takamaiman yanayin bitar.Taro daban-daban suna da tushen zafi daban-daban, kuma adadin sanyi ya bambanta.Misali, wurin aikin gyaran allura, zafi mai zafi yana da girma, yawan injinan gyare-gyaren allura a wurin, mafi girman zafi....
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