1, Mukayika valavu, muyenera kuyeretsa chigawo chamkati ndi kusindikiza pamwamba, ngati mabawuti olumikizira ali olimba, ndikuwonetsetsa ngati kulongedzako kukukanidwa.2, kuyika valavu kumakhala kotsekedwa.3, valavu yachipata chachikulu, pneumatic ...
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