规定了160 mm x 100 mm至2500 mm x 1600 mm(作为首选尺寸)的矩形或方形铸铁表面板的要求,精度分为0、1、2和3四个等级。
Specifies requirements for rectangular or square cast iron surface plates ranging from 160 mm x 100 mm to 2500 mm x 1600 mm, as preferred sizes, in four grades of accuracy 0, 1, 2 and 3.