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单词 动差
例句 DEFINITIVE EXAMPLES 权威例句〔like〕I've been up for like five days. Don't worry about me.我起床走动差不多已有5天了。别为我担心。英汉大词典〔moment〕Statistics The expected value of a positive integral power of a random variable. The first moment is the mean of the distribution.【统计学】 矩,动差:任意变量的正整数功效的期望值。第一个矩是分配的平均数美国传统
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