分析了熔炼电炉钢制造的铝型材热挤压模的失效原因及影响因素.The causes of lose effectiveness of aluminum profile hot extrusion die made - smelted steel are analyzed.按冶炼方法,钢可分为 平炉 钢 、 转炉钢和电炉钢.By refining methods steels can be divided open - hearth furn...
The story tells of a runaway slave girl in Louisiana, circa 1850.故事大约发生在1850年，讲的是路易斯安那州一个逃跑的年轻女奴。The author of this book was said to be born circa 1080 and die in 1130.传说该书作者约生于一零八零年,卒于一一叁零年.born circa 150 BC生于约公元前150年Au...
...derelict houses that were down for demolition.将要拆除的废弃房屋The church has been threatened with demolition for years.这座教堂多年来一直面临拆毀的威胁.They underwent courses in radio communication, demolition, and sabotage.他们接受了无线电通信 、 拆毁和...