...,免费经济学论文 关键词：效率研究；水泥上市公司；dea-tobit；malmquist生产力指数????? [gap=848]keywords：efficiency study ;cement listed companies; dea-tobit; malmquist productivity index ..
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operating efficiency study 经营效率研究
study efficiency 学习效率 ; 提高研究效率 ; 提高统计学效率
Study efficiency low 学习效率低下
efficiency of study 学习效率
efficiency predict study 预报效能评价
low efficiency of study 学习效率低
Study efficiency curve 学习效率曲线
raising study efficiency 提高学习效率
mathematics study efficiency 数学学习效率
At the began of this paper, the relationship between infrastructure and national economics was introduced. And then, the investment efficiency study in china and foreign country was summarized.
本文首先介绍了基础设施的特点及其与国民经济发展的关系,然后对目前基础设施的投资效率研究状况进行了概述。
参考来源 - 基于malmquist·2,447,543篇论文数据，部分数据来源于NoteExpress
By experiment, for the effect of fan expending Angle to noise and efficiency study.
通过实验研究离心风机蜗壳扩张角对风机噪声及效率的影响。
It is also the theoretical foundation of security market efficiency study in standard finance.
首先，论证了行为金融是一种证券市场效率研究的更适合方法。
As 4ztl-1800 combine gain machine fan to incline tongue with straight tongue the influence for fan noise and efficiency study.
对4ztl - 1800联收机风机倾斜蜗舌和直蜗舌对风机噪声及效率的影响进行了实验研究。
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