The rate of return this year is slightly better than that of past years. 今年的投效比往年略有起色。
According to the experimental data of HEER and HHPF given in this paper, some analysis of the energy consumption of the DVM system is done. 根据数码涡旋多联式空调系统小时能效比与小时平均供热系数的实测数据，分析了该系统能耗变化规律。
