本文介绍了国内几大联合编目中心的概况，结合样书进行下载率调查分析，为选择加入联合编目中心提供依据。
This paper introduced general situations of several domestic union catalogue center, analysed the book download rate, and provided the basis for the combined catalogue center selection.
同时也是处于这样的考虑，文章选择联合产权制度的阶段演化论这样一个分析框架来展开论述。
In such consideration at the same time, the article choose the stage evolution of union property rights institution as a framework to begin with our analyses.
方法：我们采用严格的方法选择喜好，联合分析以明确决定行腰椎手术的重要性。
Methods. We used conjoint analysis, a rigorous method for eliciting preferences, to determine the importance that respondents place on decisions for lumbar spinal surgery.
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