New Page 4 关键词：灰色GM(1，1)模型；双向差分建模；作物产量预测 [gap=448]Key words： the grey model GM(1,1);two direction difference;output of crop forecasting
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bi-directional differential method
... degeneracy control 防变质 bi-directional differential method 双向差分建模 cyclic variation of integrated backscatter 背向散射周期性变化值 ...
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