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It could be applied to blackening treatment for iron and steel or cast iron surface.
适用于铸铁及钢铁表面的发黑处理。
youdao
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2 cast iron guardrail surface best after pickling.
铸铁护栏表面最好经过酸洗处理。
youdao
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2 cast iron guardrail surface best after pickling.
铸铁护栏表面最好经过酸洗处理。
youdao