Pretreatment business is an assistant industry of the national economy, it is the necessary technics for many manufacturing.
表面处理产业是国民经济众多工业领域中的辅助产业，表面处理是许多制造工业必需的工艺。
Pretreatment business is an assistant industry of the national economy, it is the necessary technics for many manufacturing.
表面处理产业是国民经济众多工业领域中的辅助产业，表面处理是许多制造工业必需的工艺。
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