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 9 vocational schools in Ktmming are selected by using the convenience sampling method.

youdao

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 9 vocational schools in Ktmming are selected by using the convenience sampling method.

youdao