retrospective survey meaning in English

追溯调查

A retrospective survey of general historical writings in the 20th century
20世纪历史学概论性著述的回顾与评说
The retrospective survey of malignant tumor in weapon workers exposed to 2 , 4 , 6 - trinitrotoluene
兵器行业三硝基甲苯作业工人恶性肿瘤的回顾性调查研究
Analysis of clinical characteristics and death related factors of severe meconium aspiration syndrome - a multi - center retrospective survey
重症胎粪吸入综合征患儿临床与死亡相关因素分析
Methods : using the methods of retrospective survey , 203 patients with copd are evaluated by using and cost - effectiveness analysis
方法：采用回顾性研究，对203例接受两种疗法的本病患者进行成本-效果分析。
In this paper , based on the retrospective survey study of the present status of the present status of the technique and the actual need of the project and hospital , the intelligent electrocardiograph based on net is designed
本文在对国内外技术现状的充分调研后，结合课题研究和医院实际的需要，设计出了智能网络型的心电图仪。

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