Measuring the seasonal variation in a time series, we generally use two methods to calculate seasonal indexes—average of original data, trend adjustment for 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。

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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.

从制冷系统节流机构的流量调节稳定性、过热度控制原理、系统节能、瞬态反应特性、部分负荷调节特性方面，比较分析了几种节流机构应用于制冷装置中的特点。

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