适当的公式和图表总是会平均平均或平均分散使用的统计计算。
The proper formulas for average and range charts will always use an average or median dispersion statistic in the computations.
因此，电能的集中开发与分散使用，以及电能的连续供应与负荷的随机变化，就制约了电力系统的结构和运行。
Therefore, the concentration of development and decentralized energy use, as well as a continuous power supply and load a random change, it restricted the power system structure and operation.
一位专家表示，在上课时间使用手机会分散学生的注意力。
An expert said mobile phone use was a distraction to students during school hours.
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