The measuring method is low precision N inefficient and strong intensity of labour.

这种测量方法测量精度低、效率差、劳动强度大。

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The engineering practice proves that GM(1, N) model possesses rather good precision and forecast dependability comparing with GM(1,1) model , which hase some applied value on settlement forecast.

通过工程实例，证明GM（1，N）模型与GM（1，1）模型相比有较好的拟合精度和预测可靠度，对沉降预测有很大参考价值。

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The principle which will decide the value of the truncation index N not only insures the computing precision for T-matrix method but also ensures the computing convergence.

取值的原则是既要保证T矩阵方法的计算精度也要保证计算的收敛性。

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