an empirical study based on Wuling mountain area an empirical study based on the firms in China an empirical study based on tone analysis an empirical study based on typical cases 民族地区学前教育发展:基于武陵山片区的实证研究:an empirical study based on Wuling mountain area an empirical study based on China an empirical study based on Chinese experience An empirical study based on macroeconomic cycle an empirical study based on team learning theory the empirical study based on ohlson model