In connection with the features of the power station and bulb 'turbine unit, the optimal selection of turbine type and parameters is briefly described.

结合电站及灯泡贯流机组的特点，简要介绍电站水轮发电机组机型及其参数的优化选择。

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Secondly, the method of region feature extraction and optimal feature selection are studied based on PCA, and the effective features are constructed for the target by the analysis of the PCA.

其次，本文研究了区域形状特征提取及基于PCA的特征选择方法，通过对区域特征进行优化选择，构造准确描述目标特性且维数较低的特征。

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