The working principle and structural characteristic of Canned motor pump are briefed, the advantages and disadvantages of this pump are analyzed and Puts forward attentions in type selection.

简要介绍了屏蔽泵的工作原理和结构特点，分析了该类型泵的优缺点以及选型注意事项。

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Aiming at the preceding problem, this paper puts forward a feature selection method using Information Gain (IG) and Principle Component (Analysis) (PCA).

针对上述问题，提出了信息增益(IG)与主成分分析(PCA)相结合的特征选择方法。

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The paper briefly states the function of urban road green, and also puts forward the green principle, plant disposition and selection of tree seeds on different roads and green belts.

简述城市道路绿化的功能，提出不同道路及绿带的绿化原则、植物配置和树种选择。

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