<正> The main objective of the present study was introduced water mist suppressiontechnology to prevent and control gas burning which occurred during drilling a
<正> In order to understand the mechanism and regularity of the groundwater con- tamination from mine water of abandoned mines,experiments were conducted on an
<正> Give constrains of costs and technology in analysis,actual practice of 2D FEM is widely popular and demanded.In order to take advantage of 2D FEM to simula