The heat pumps are very sensitive to the change of ejection fluid pressure. A minor change in the ejectionpressure can lead to a drastic reduction in the heat pump operating performance.
而热泵对引射流体压力的变化极为敏感，引射压力的微小变化可能导致热泵操作性能的急剧下降；
2
Most of studies overlooked sleeve type ejection gun and the effect of pressure area changes, simultaneously the models of ejection gun were lack of extensity.
以往研究中对多级弹射筒和压力有效作用面的影响重视不足，并且所建模型通用性差。
3
A mathematic model was constructed to describe the interactions between ventricular pressure, arterial pressure, arterial volume, peripheral blood flow, and ventricular ejection volume.