Often used in capital budgeting, IRR is the interest rate that makes net present value of all cash flow equal zero.
IRR经常用于资本预算，它是使得所有现金流动的净现值为零的利率。
Using the model, the liquid holding efficiency and pressure drop of gas lifting flow with liquid flow rate being zero was calculated.
提出了零液流量气提流动的两相流水动力学模型，应用该模型计算了零液流量气提流动的持液率和压力降。
When the regulation is performed by variable flow rate, there exist two operation regulation modes with fixed zero pressure difference and variable zero pressure difference.
采用变流量调节时，存在定零压差点和变零压差点两种运行调节方式。
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