A time series data set is a sequence of random variables indexed by time.
时间序列数据是以时间为指标的一个随机变量序列。
Considering the randomness of strength and deformation of concrete material, a mathematic approach of producing random variables series of concrete ultimate tensile strain is proposed.
针对混凝土构件材料强度和变形性质的随机性，采用数学方法提出构造混凝土极限拉应变数列的原理。
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