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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Which types of hot water flow in system can be informed (from the flow of water for that), easy to predict performance, and may also be calculated in some time in the water heating.

由此种型式的热水系统的流量可得知(因来自水的流量可知)，容易预测性能，亦可推算于若干时间内的加热水量。

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