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一、单项选择题1.时间数列中,每个指标数值可以相加的是().①相对数时间数列②时期数列③时点数列④平均数时间数列
First, the individual multiple-choice questions 1. Time series, each indicator value can be added (). ① relative number of time series ② time series ③ time series ④ average time series