It's cheaper, but it takes longer time. RkS.

坐火车更便宜一些，但是花的时间要长。

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The precisions and the applicable ranges of the modified RKS, pr and PT equation are very similar to those of the original equations.

用该式改进的RKS、PR和PT方程在精度与适用范围方面均与原方程十分相近。

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The method and technique of calculating thermo-physical properties of natural gas using RKS equation are mainly introduced in this paper.

介绍了采用RKS方程求解天然气热物性的求解方法和技巧。

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