为了评价和比较热泵机组与其它冷暖设备的能耗，大约有30篇论文涉及此问题。
For the evaluation and comparison of heat pump units and other heating equipment, energy consumption, has around 30 questions in this thesis.
根据195 1 ~ 1999年黑龙江省代表站的历年逐月的气温、降水量资料，用计算趋势系数的方法，研究了东北北部冷暖旱涝趋势的问题。
The trends of temperature and precipitation in the north of the Northeast China are studied by using the trend coefficient based on the 1951 ~ 1999 data over 6 stations in Heilongjiang Province.
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