Methods 9 vocational schools in Ktmming are selected by using the convenience sampling method.
采用方便抽样的方法，抽取昆明市主城区9所中等职业技术学校。
Methods 15 lying-in women were chosen through the method for convenience sampling using the qualitative research.
方法采用质性研究的方法，用便利取样的方法选择15名产妇通过访谈收集资料。
Methods 15 lying-in women were chosen through the method for convenience sampling using the qualitative research.
方法采用质性研究的方法，用便利取样的方法选择15名产妇通过访谈收集资料。
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