The light weight automobile for saving in energy which enjoying increasing popularity.
为了节能，汽车的轻量化已越来越受到人们的重视。
Improvement on energy saving effect of a compound balance beam pumping unit with downward beam balance weight
下偏杠铃游梁复合平衡抽油机及节能技术改造
Research on the saving energy effect of a compound balance beam pumping unit of beam balance weight deviated downward
下偏杠铃复合平衡游梁式抽油机的节能效果分析
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