The use of frequency division duplex (FDD).

使用频分双工(FDD)。

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The duplex melting process by Blast and Medium-Frequency Induction Furnaces for cast iron production has been studied.

对高炉-中频炉双联短流程熔炼生产铸铁件工艺进行了分析研究。

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It was investigated that the short-cut process of producing high quality iron castings by duplex melting with blast furnace and medium frequency induction furnace.

分析了高炉 中频炉双联熔炼短流程生产工艺的特点，采用液态金属状态测评系统研究短流程铁液状态。

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This is known as FDD or frequency division duplex.

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