根据提出的系统模型利用动态神经网络对加工过程质量特征参数的变化进行了跟踪实验，效果良好。

Based on this system, a dynamic neural network is used to track the change of quality characteristics during manufacturing process. Numerical simulation and practical experiment show good results.

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结论平扫加动态增强MRI能良好反映孤立性坏死结节的病理特征，其表现具高度的诊断特异性，明显优于超声和CT。

Conclusion Findings of both plain and dynamic enhanced MRI can correlate well with pathologic characteristics and are highly specific for diagnosis of SNN obviously superior to us and ct.

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