求翻译：四、矿井通风设计。根据矿井开拓开采条件，确定矿井通风方式为中央并列式通风，风量分配由内向外计算。工作面使用“U”型通风，掘进工作面用局扇采用压入式通风。根据通风容易、困难时期的最大阻力选择“2K56-No18”型主扇，矿井用风机反转反风，主扇及电机选型合理，通风成本较低。是什么意思？

Fourth, the mine ventilation design. Mining conditions, according to the mine development to determine the parallel mine ventilation for central ventilation and air distribution calculated from the inside out. Face ventilation, use "u" and the heading face pressed into the local fan ventilation. Ven

4, mine ventilation design. According to mines and mining conditions, mine ventilation for the central side-by-way airflow, an air distribution calculated from inside out. Work with the U" ventilation, boring work surface into a board with push-in ventilation. In accordance with proper ventilation a

Fourth, mine ventilation design.According to the mine pit development mining condition, the definite mine ventilation way ventilates for central compound -like, the amount of wind assignment from inside to outside calculates.The working surface use “U” ventilates, the tunneling working surface uses

Four, mine ventilation design. According to the mining shaft development conditions, determine how the mine ventilation for Central side-by-side ventilation, air flow calculation of distribution from the inside out. Face uses the "u" type of ventilation, local fan in heading face pressed into the ve

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