甲从学校乘车回家,途中有3个交通岗,假设在各交通岗遇红灯的事件是相互独立的,并且 发布时间:2017-05-17 19:01 │ 来源:www.tikuol.com 题型:填空题 问题: 甲从学校乘车回家,途中有3个交通岗,假设在各交通岗遇红灯的事件是相互独立的,并且概率都是25,则甲回家途中遇红灯次数的期望为______.
题型:填空题 — I am interested in that laptop. It seems to be the latest style.What do you charge for it?— $8000.— ________, but I can't afford it. [ ]A. It's worth that B. It's really niceC. Please lower the price D. That's too dear 查看答案