以下为句子列表：
英文: The calculation formulas for velocity coefficientsφ2 and φ5 for the throat and throat inlet section were deduced from the theoretical research on the velocity coefficients in time-averaged basic equations by use of the unsteady momentum equation and time-
中文: 摘要运用非恒定的动量方程和时均值计算方法，对脉冲液体射流泵时均值基本方程中的流速系数进行了理论研究，推导出了喉管和喉管进口段流速系数φ2和φ5的计算式。
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