Density is a logarithmic unit that describes the ratio between light hitting the film and light being transmitted through the film.
密度是一个对数单位，介绍了光线击中通过电影传播电影和光线之间的比例。
This paper presents a method for calculating the modal logarithmic decay ratio of the shaft set torsional vibration in a turbogenerator unit.
本文给出了一种汽轮发电机组轴系扭转振动模态对数衰减率的计算方法。
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