Presents the selection and calculation method and quantity determination of the circulating water pumps, and the operation characteristics of the pumps in parallel.
介绍了循环水泵的选择计算方法，循环水泵台数的确定原则，以及水泵并联运行的特点。
Described is the determination of the renewal of the present number of cars with the calculation and prediction method of the "Rolling Stock Operation Financial Balance Table".
介绍了通过“车辆运营财务平衡表”的计算和预测方法确定车辆保有量的更新。
The optimum acidity range of spectrometric determination with ternary coordination compound was studied mathematically in this paper, and simple calculation method was also provided.
从数学上对三元配合物用于光度分析时适宜酸度范围问题进行了探讨，并给出了简便的计算公式。
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