A cikin tsarin yin amfani da manne-narke mai zafi, saboda canje-canje a yanayi daban-daban, za a fuskanci matsaloli daban-daban.Don magance waɗannan matsalolin, dole ne ku sami cikakkiyar fahimta da cikakken nazari akan abubuwa daban-daban.Kamar zafin jiki, zafi, kauri, gudun, saman, p...
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