According to the energy loss of every part of screw pump well, established system efficiency analysis model for the well.
根据螺杆泵井各个部分运动特点及能量损失情况，建立了螺杆泵井系统效率分析模型。
In the fourth chapter, the thesis built an efficiency analysis model of FMCG brand extension in the presence of DEA methods and combining the characteristics of FMCG.
在第四章借助DEA方法结合快速消费品的特点构建了快速消费品品牌延伸有效性分析模型。
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