The Cast Iron Surface Plate can be classified as Grade 0, 1, 2, 3, 4 according to the national standard metrological verification procedures.
铸铁平台精度：按国家标准计量检定规程执行，分别为0,1,2,3级四个级别。
Not the correct use of cast iron plate, if use flat surface roughness of workpiece inspection can cause soon wear etc.
不正确使用铸铁平板，如用平板检验表面粗糙的工件会造成很快磨损等。
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