Measuring the seasonal variation in a time series, we generally use two methods to calculate seasonal indexes—average of original data, trendadjustmentfor average.
测定季节变动对时间序列的影响，一般按同期平均法（原资料平均法）和趋势剔除法计算季节比率。
2
The strengths for flow regulation and superheat adjustment of electronic expansion valve are purposed, as well as the development trend is analyzed in air-conditioning or commercial freezing area.