单选题:Fermi, an experimentalist as well as a theoretician, won a N 题目分类:理工类 题目类型:单选题 查看权限:VIP 题目内容: Fermi, an experimentalist as well as a theoretician, won a Nobel Prize for producing the first nuclear chain reaction in the world. A.A Right B.B Wrong C.C Not mentioned 参考答案: 答案解析:
Enamel, the hardest substance in a human being's body, cover Enamel, the hardest substance in a human being's body, covers the entire crown o 分类:理工类 题型:单选题 查看答案
完全正相关的证券A和证券B,其中证券A的期望收益率为20%,证券B的期望收益率为5%。如果投资证券A、证券B的比例分别为 完全正相关的证券A和证券B,其中证券A的期望收益率为20%,证券B的期望收益率为5%。如果投资证券A、证券B的比例分别为70%和30%,则证券组合的期望收益率为 分类:理工类 题型:单选题 查看答案