1. Cov ntaub ntawv 1. Cov khoom siv sab hauv uas pheej yig tshaj yog ua los ntawm cov khoom siv EVA, uas yog ib qho nyuaj, tsis yog mos, thiab tsis muaj elasticity thaum nyem tom qab kev nce nqi;nws cuam tshuam rau qhov tseeb thiab qhov tseeb ntawm kev kuaj ntshav siab;2. Thib ob, qee cov tshuaj ntsiav sab hauv yog ua los ntawm latex, uas yog softe ...
Nyeem ntxiv