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各预测模型性能对比 (a): SG平滑-神经网络预测模型; (b): SG平滑-主成分回归预测模型; (c): 多元散射校正-神经网络预测模型; (d): SG平滑-主成分回归预测模型; (e): 移动平均平滑-主成分回归预测模型; (f): 多元散射校正-主成分回归预测模型