本文还对热泵干燥、电加热干燥、蒸汽加热干燥的一次能源消耗和能源费用进行了比较和经济评价。

The primary energy consumption and the energy cost of the heat pump dryer are compared with those of electrical heating dryer and steam-heating dryer and their economic evaluations are carried out.

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从环境经济学的角度，对一般常用的小型燃煤锅炉与燃油(气)锅炉的环境影响及运行费用进行了比较分析。

Environmental impact and running expense of minitype gas-fired boiler and oil-fired boiler are compared and analyzed in this paper from the environmental economy Angle.

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从产权经济学角度看，节庆经济也有一个交易费用的比较问题。

From the view of economy of property right, festival is also a comparative question of trading expenditure.

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