qualitative study短语¹⁴⁴⁹⁷²⁺² 基本例句 定性研究 TB suspect patients among rural to urban migrants were involved by questionnaire survey and qualitative study, including FGD and in- depth interview, were applied in this study. 对229例流动人口结核病疑似患者采用问卷调查，开展多次专题小组讨论和个人深入访谈。 chemyq