By adjusting main drain off water pump flow quantity, this paper makes main drain off water equip running safe, economy, saving investment.
通过调整矿井主排水泵流量，使矿井主排水设备安全经济运行，节约投。
If we equip gas tubes and nitrogen flow controller, it can be used as a concentrator.
在配备气管和氮气流量阀就可以作氮吹浓缩器使用；
If we equip gas tubes and nitrogen flow controller, it can be used as a concentrator.
在配备气管和氮气流量阀就可以作氮吹浓缩器使用；
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