求翻译：样本分为5组并采用固体涂层法在表面人工均匀刷污，每组8片绝缘子具有相同的盐密和灰密，对应于绝缘子污秽等级的0、I、II、III、IV级是什么意思？

The sample is divided into five groups and solid coating method in the surface of artificial uniform brush, dirt and have the same salt density and ash density (n = 8) insulator, corresponding to the insulator contamination levels 0, i, ii, iii, iv class

sample is divided into 5 groups, and a solid coating in law manual evenly Brush dirt surface, a group of 8insulated sub-chip with the same salt and gray key, the corresponding to the filthy insulation rating of 0, I II , , , III IV level

The sample divides into 5 groups and uses the solid coating law artificially to brush the dirt evenly in the surface, each group of 8 piece of insulators have the same salt dense and the ash are dense, correspond to the insulator contamination rank 0, I, II, III, IV level

Samples are divided into 5 groups of solids coating method and in the artificial surface evenly stain brush, each set of 8 pieces have the same salt deposit density of insulators and gray keys, corresponding to the insulator contamination levels 0, I, II, III, IV level

正在翻译，请等待...