In 1952 in the austrian towns of Linz and Donawitz, a steelmaking process was established. This was the LD process, which used oxygen gas for the oxidation of impurities in iron.是什么意思_In 1952 in the austrian towns of Linz and Donawitz, a steelmaking process was established. This was the LD process, which used oxygen gas for the oxidation of impurities in iron.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句