exhaust hole造句

• The results indicate that the flow velocity is lower and the pressure is high in majority of the step cylinder , the distinct variations of the flow field occur in the threshold of the step cylinder at the bottom and the abrupt transition sections , the holes in the inner and outer tubes and the exhaust hole
  结果表明：步进缸内大部分区域流体流速较小，压力较高，且变化不大，发生明显变化的部位主要分布在步进缸底部水管入口及截面突变处、内外套对孔处和排气孔处。