... grade-index 递级指数 graded coating 等级涂层 graded deposit 递级淀积层 ...
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等级涂层
Grade coating
以上为机器翻译结果，长、整句建议使用 人工翻译 。
如果钢表面发生上述损坏，产生锈，用电力工具对表面进行清除，处理至二次表面处理等级，涂上一层与原始油漆一样的涂层。
When such damage comes to the surface of steel and rust occurs, the surface shall be cleaned by power tools to the secondary surface preparation grade and coated as originally painting scheme.
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