Steel having a steady abrasive sample etchech on No.4 solutions. It is generally employed for building construction materials for the two interior and exterior as well as for sash, doorways, and panels in propertiesTh2 ?ng vi sinh dùng trong th?c ph?m – Tiêu chu?n và ?ng d?ng Ch?c n?ng bình lu?n b? t?t ? ?ng vi sinh dùng trong th?c ph?m –