前后比较法
- 网络before-and-after method
前后比较法-
用药4周后，采用自身前后比较法及组间对照比较法。
After four weeks , adopt the comparison method of self-circa and inter-contrast .
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通过比较数据仓库应用中的“时标法”和“前后映像比较法”这两种数据追加技术的优点和不足，提出了一种基于日志的数据追加技术的设计方法。
Through comparing the advantages and disadvantages of the " data flag " and " comparison images " data super addition technologies , this paper presents a design method of data supper addition based on log .