Energy efficiency (net energy gain or energy ratio) of corn-based ethanol as a substitute for fossil fuel is an important criteria for assessing its sustainability.
玉米燃料乙醇作为化石燃料的替代品，能量效率(净能量或能量比)是评价其可持续性的一个重要标准。
Relevant operation shows that owing to the change of the feed Angle piercing efficiency has been increased, net rolling time reduced, and unit energy consumption lowed.
生产实践表明，送进角改进后穿孔效率提高，纯轧时间减少，单位能耗降低。
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