Swing-type check off er the least pressure drop and offer simple automatic closure; when fluid flow stops gravity and flow reversal closes valve.
旋启式止回阀压降最小，能够完全自动关闭，即在介质流动停止、重力和介质倒流的状态下自动关闭阀门。
2
If you do a biopsy you can see a reversal of these pathophysiological changes and blood pressure comes down.
如果你进行活检，你会看到这些病理生理改变的逆转，且血压降低。
3
Due to the influence of the elastic deformation of flexible structures, the efficiency drops constantly with the increase of the dynamic pressure, which even causes aileron reversal.