求翻译：毕业设计主要是设计湖北某铁矿2号矿体的开采设计，内容包括矿床开拓、采矿方法设计、矿井通风和三废处理等，其中毕业设计专题为采矿方法的设计。根据矿体地质条件，初选平底结构分段空场嗣后充填法、电耙结构分段空场嗣后充填法和无底柱分段崩落法进行比较，通过技术经济综合比较，最后选择技术上合理、经济上可行的平底结构分段空场嗣后充填法。通风系统采用中央式压入通风。是什么意思？

The graduation project is the No. 2 ore body design Hubei iron ore mining design, including the deposit development, mining methods, mine ventilation, and waste treatment, graduation design project for the design of mining methods. Geological conditions according to the ore body, the primary flat st

He graduated from design is primarily a design Hubei No. 2 iron ore mining in the ore body design, content development, mining deposits including design, mine ventilation and 3 waste, and so on, which is mining design graduate of the design. orebody in accordance with geological conditions, flat-bot

Graduation design is to design a 2nd ore body mining of iron ore in Hubei design, including development of mineral deposits, mining method design, mine ventilation, and waste disposal, graduation design for the design of mining method. According to the ore-forming geological conditions and end of pr