Therefore, the paper select the four core cities as case studies, and discuss the social and economic development of four core cities in northeast.
因此，本文选择东北四大核心城市为研究个案，对其社会经济集聚情况进行分析。
By comparison of various evaluation methods, the paper select Extension Superiority evaluation method as a method for evaluation study of various heating modes.
通过对各种评价方法进行比较，本文选用可拓优度评价方法作为对各种供热采暖方式进行评价研究的评价方法。
In today's China, the research and development about customer satisfaction are in the initial stage, this paper select colleges and universities in Changchun area as a study.
如今中国顾客满意度研究处于初始阶段，本文选择长春地区高等学校作为研究对象，对此课题进行探讨性研究。
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