布袋中装有1个红球,2个白球,3个黑球,它们除颜色外完全相同,从袋中任意摸出一个 发布时间:2017-05-02 22:00 │ 来源:www.tikuol.com 题型:选择题 问题: 布袋中装有1个红球,2个白球,3个黑球,它们除颜色外完全相同,从袋中任意摸出一个球,摸出的球是白球的概率是( )A.12B.13C.16D.23
题型:选择题 What did the person do during the vacation a. Stayed at home. b. Exhausted myself. c. Hardly had any rest. d. Don’t know. 查看答案