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backing weld
词语: backing weld
解释: 底层焊接
词性: 名词
词典: 冶金专业英汉词典
backing weld 相关解释
backing weld 〔名词〕背焊
backing weld 〔名词〕底焊,底层焊接
底层焊接 backing weld;backing welding