常用表示频数分布集中趋势的指标有（）。A.全距 B.四分位数间距 C.方差 D.标准 发布时间：2017-07-26 16:56 │ 来源：www.tikuol.com 题型：多项选择题 问题： 常用表示频数分布集中趋势的指标有（）。A.全距B.四分位数间距C.方差D.标准差E.构成比
题型：多项选择题 Food supplies in the floodstricken area ________. We must act immediately before there's none left. [ ]A. have run out B. are running out C. have been run out D. are being run out 查看答案
题型：多项选择题 口语应用。从方框中选出最佳选项补全对话。A. I want to buy a hat for myself. B. How much is it ? C. What color do you want? D. What about this one? E. OK. Here you are A: What can I do for you? B: 1____________ A: For yourself? These are all for young people. 2____________ B: I like the blue one. A: 3____________ B: Thank you. 4____________ A: One hundred yuan. B: Oh, it costs too much. A: 5____________ It is cheaper. It is only fifty yuan. B: OK. I'll take it. Thank you 查看答案