Primary energy efficiency and impact on environment of different cold sources have been compared in this article.
本文对不同冷源的一次能源利用效率进行了比较，并且比较了它们对环境影响的情况。
Primary energy efficiency and impact on environment of different cold sources have been compared in this article.
本文对不同冷源的一次能源利用效率进行了比较，并且比较了它们对环境影响的情况。
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