净能源，是指除去能源投资后得到的能源回报的净剩余值。
建立了木薯-汽油混合燃料考虑可再生性的生命周期净能源成本优化模型，并对木薯乙醇-汽油混合燃料考虑可再生性的生命周期净能源成本指标进行了优化。
An optimization model on life cycle net energy cost related to renewability of cassava-based ethanol blended gasoline fuels was given in this paper.
法国74%的电力来自于核力发电，它还是世界上最大的核能源净出口国。
About 74% of the country's electricity comes from nuclear sources and it is the world's largest net exporter of nuclear energy.
丹麦是食品和能源的净出口国，有稳定的收支平衡。
Denmark is a net exporter of food and energy and has a comfortable balance of payments surplus.
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