相比互联网数据，金融数据的特点也很突出，如频率较低，但质量较高等。
Compared to Internet data, the characteristics of financial data is also very prominent, such as low frequency, but higher quality.
围绕声呐方程，论证了相关计程仪设计时应考虑的一些问题，如频率的选取，作用距离的估计等。
Some problems, such as the choice of frequency, estimation of the distance and so on, are discussed according to sonar equation, which should be considered in designing an acoustic correlation log.
而其它方面的特性，如频率、电压波形、各相平衡则很少被用户认识到，但这恰恰受到电力部门工程师们的时刻关注。
Other characteristics, such as frequency, wave shape, and phase balance are seldom recognized by the consumers but are given constant attention by the electric power utility engineers.
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