bifora
二孔型房间隔缺损 atrial ostium secundum defect
二辊孔型 two roll pass
比较研究了薄板坯连铸用二孔型水口和四孔型水口流场特征，水模试验结果表明，采用两种水口的薄板坯结晶器流场均存在非稳定性现象。
The characteristics of fluid flow in the mould of two ports SEN and four ports SEN have been compared and the influences of SEN on the level fluctuation are investigated by water modeling experiment.
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