Simbi isina tsvina inowanzoshandiswa nesimbi muhupenyu hwedu hwezuva nezuva, ine huwandu hwakawanda hwekushandisa.Nekuda kweizvozvo, kukwenenzvera nekukuya kunoshandiswawo zvakanyanya.Kune nzira dzakasiyana-siyana dzekurapa kwepamusoro, kusanganisira flat grinding, vibratory grinding, magnetic...
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