The track geometry irregularity is a stable normal distribution and state-history random variable.
轨道几何不平顺为平稳的正态分布和各态历经的随机变量。
The paper affirms the stochastic properties of household gas consumption, and then proves a random variable in normal distribution.
本文通过分析确认了居民燃气消耗量的随机性，进而证明其为服从正态分布的随机变量。
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