设甲、乙、丙三个加工厂共生产玩具6000件,其中甲厂生产了1440件.现采用分层 发布时间:2017-05-03 11:42 │ 来源:www.tikuol.com 题型:填空题 问题: 设甲、乙、丙三个加工厂共生产玩具6000件,其中甲厂生产了1440件.现采用分层抽样的方法从三个加工厂抽取一个容量为500件的样本进行质量检测,则应从甲加工厂抽取______件玩具.
题型:填空题 Susan Jones was at the bus stop well on time to take the 7:01 bus, but she had to miss her breakfast to do it.A.catch up withB.catchC.run up toD.be catching 查看答案