It dealed with the problem of brazing of steel hardware and copper that nitrogen base controlled atmosphere continuous brazing furnace.
研制的氮基可控气氛连续钎焊炉，成功地解决了钢质零件的铜钎焊问题。
It dealed with the problem of brazing of steel hardware and copper that nitrogen base controlled atmosphere continuous brazing furnace.
研制的氮基可控气氛连续钎焊炉，成功地解决了钢质零件的铜钎焊问题。
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