I have seen one of the conventional steelworks: huge blast furnace, converter, steel ingot, miles of railway track.
我参观过传统的炼钢厂：巨大的高炉、转炉、钢锭，长达几英里的铁轨。
I had saw one of the conventional steelworks: huge blast furnace, converter, steel ingot, mile of railway track.
我参观过传统的炼钢厂：巨大的高炉、转炉、钢锭，长达几英里的铁轨。
In this paper, the principle and properties of power source high voltage frequency converter are introduced as well as its application in mixer fan of steelworks.
文章主要介绍了动力源高压变频器原理、性能及在炼钢混铁炉风机中的应用情况。
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