<正> Through the usage of simulation software based on the network layout,airway resistances and parameters of main fans,ventilation calculations were performed
<正> Through the research on the model of the land reclamation in the refuse dumpof Heidaigou open coal mines,it was concerned that ecology was the theoretical
<正> The main objective of the present study was introduced water mist suppressiontechnology to prevent and control gas burning which occurred during drilling a