非参数统计主要是利用样本数据的()来研究统计推断的问题。
参考答案:相对大小关系
根据课文内容填空。 (5分)
Amy is my _____1___ friend. She is a __2_______ of the Swimming Club. She is a very good ____3______. We always ____4____ a good time at school.
We often dress up ____5___ Halloween. We wear ____6____ costumes ___7____ masks. We sometimes ____8___ our faces and people do not know ____9_____ we are. It is ____10______. This year, I will wear a tiger costume.
创新是一个民族发展的灵魂,中 * * 自古以来就有不少的创造发明。下列人物对我国古代科技发展做出重大贡献的是①蔡伦 ②毕昇 ③郑成功 ④司马迁
A.①③
B.①②
C.①②③④
D.③④