T?m Grating ???c t?o lên b?i nh?ng thanh thép ph?ng, thép xo?n ho?c r?ng c?a ch?u l?c ???c ??t music music v?i kho?ng cách b?ng nhau.DURAGRID® tailor made grid and grating methods are created to accommodate distinct apps that can't successfully be met by a standard fiberglass grating.Công th?c tính kh?i l??ng t?m grating 1/ Công th?c tính