In normal particulate filtration, liquid is forced under pressure through a porous medium. In ultrafiltration, similarly, liquid is forced under pressure through a porous medium.
一般的过滤是在压力作用下强行是液体通过多孔介质，同样，在超滤中，也实在压力下强行通过多孔介质。
By using medium to stop discharging, the non-equilibrium plasma nitriding under normal pressure can be made in self developed equipment.
利用介质阻挡放电，在自行研制的设备上进行常压非平衡等离子体渗氮的研究。
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