【简答题】描述呈倍数关系的数值变量的指标是 @font-face {
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【简答题】Yesterday my grandfather told me about his early days. he left school, he found a job in a post office. He worked hard there. Soon he had more money than his friends because of his hard work. It seeme...
【单选题】描述数值变量呈倍数关系资料的集中趋势指标是( )