将n个球放入m个盒子中,某指定的一个盒子是空的概率______. 发布时间:2017-05-06 12:39 │ 来源:www.tikuol.com 题型:填空题 问题: 将n个球放入m个盒子中,某指定的一个盒子是空的概率______.
题型:填空题 ---How did the accident happen? ---You know, it ________difficult to see the road clearly because it_________. A.was; was rainingB.is; has rainedC.is; is rainingD.will be; will rain 查看答案