气液两相平衡计算。ＰＲ状态方程计算ＥＯＳ。闪蒸计算，返回逸度，组分摩尔数。可以直接调用-Liquid two-phase equilibrium calculations. PR equation of state EOS. Flash calculations, returns fugacity number of moles of the components. You can directly call