多年平均值的主周期为32天，次周期为17天。
The primary period of normals is 32 days and its subperiod is 17 days.
每个人都有自由，但他是多年平均值的意思是自由。
本文第二部分建议确定年调节水库不足与多用水量多年平均值的计算方法。
In the second part, this paper develops a method of calculation of the mean water deficit, and surplus of the annual flow regulation.
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