People will also take vacations _____ ot 发布时间:2017-06-18 00:25 │ 来源:www.tikuol.com 题型:选择题 问题: People will also take vacations _____ other planets. [ ]A. in B. on C. at D. to
题型:选择题 从某批灯泡中随机抽取10只做寿命试验,其寿命(以小时计)如下:1050,1100,1120,1280,1250,1040,1030,1110,1240,1300.则该批灯泡寿命标准差的点估计值等于 .(结果保留一位小数) 查看答案