求翻译：样本分为5组(每组7片正常，1片零值)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 (n = 7 normal, a value of zero) uses solid coating on the surface of artificial uniform brush sewage (n = 8) insulator have the same salt density and ash density, corresponding to the insulator contamination levels 0 , i, ii, iii, iv level

sample is divided into 5 groups, each group 7 is normal, and part 1 is a solid value) coating on the surface the artificial evenly Brush dirt, a group of 8insulated sub-chip with the same salt and gray key corresponds to the insulator filthy I , 0, , II III IV , level

The sample divides into 5 groups (each group of 7 normalcy, 1 piece of zero value) 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,

Samples were divided into 5 groups (each group 7 slices of normal, 1 zero value) solid coating evenly in the artificial surface 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 leve

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