抽样单位为群体,再从群体中随机抽样的方法称为A.单纯随机抽样 B.系统抽样 C.分层 发布时间:2017-12-05 08:26 │ 来源:www.tikuol.com 题型:单项选择题 问题: 抽样单位为群体,再从群体中随机抽样的方法称为A.单纯随机抽样B.系统抽样C.分层抽样D.整群抽样E.多级抽样
题型:单项选择题 Her father _______ in the USA for another year, so that she could work toward her master’s degree.A.agreed her to stayB.hoped her to stayC.approved of her stayingD.let her staying 查看答案