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文献〔１〕给出了等距时间序列的灰色预测ＧＭ（１，Ｎ）模型，本文把它推广到非等距时间序列，得到了相应模型，并应用于地下工程的几个实例
Literature [1] gives the gray prediction GM (1, N) model of equidistant time series. In this paper, it is extended to non-equidistant time series, and the corresponding models are obtained and applied to several instances of underground engineering