The index formula shows simple, easy to be calculated, simple to be used and objective, universal and comparative.

该公式形式简单，易于计算，方便实用；并具有客观性、可比性和通用性特点。

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Some experiments show that double projection normalization vectors are not only easy to be calculated, but also good for recognizing English characters with the same font but in different sizes.

聚类和识别实验表明双投影归一化向量不仅计算简单，而且对同种字体不同字号的英文字符识别可达到较好的结果。

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A comparison of calculated effectiveness factors with experimental data shows that FEM has the advantages of simplicity and accuracy and it is easy to be used to analogous systems.

实际计算所得效率因子与实验值对照表明，本法结果准确，过程简单，容易推广应用于各种相类似的体系。

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