Kodi chitsimikizo cha khalidwe la mankhwala ndi chiyani?
Kuonetsetsa chitetezo ndi kudalirika kwa ntchito yopanga,Tili ndi njira zonse zogwirira ntchito ndi momwe timagwirira ntchito,Tsatirani mwatsatanetsatane njira yopangira,Zogulitsa ndi ntchito zadutsa kwathunthu ISO9001 quality system certification yapadziko lonse lapansi。