Metal that has a continuous abrasive sample etchech on No.four items. It is usually employed for constructing design elements for both interior and exterior together with for sash, doorways, and panels in structuresTh2 ?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 –