单词fev
网络: 钒铁(Ferro Vanadium)；强制进化病毒(Forced Evolutionary Virus)；用力呼气容积(forced expiratory volume)
This paper introduces the trial production of hot-rolled bar HRB400 by microalloying process of "FeV+nitrogen enrichment agent" .
前言：介绍利用“钒铁+富氮剂”微合金化工艺生产HRB400热轧螺纹钢筋的工业试验。