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iso батлагдсан dingli өндөр хүчин чадалтай жижиг чулуу …
ISO is an independent non-governmental international organization with a membership of 160 national standards bodies Through its members it brings together experts to share knowledge and develop voluntary consensus-based . өндөр хүчин чадалтай чулуу бутлуур gfpөндөр хүчин чадалтай цохилтот ...
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