A:ratio of the two sample variances B:difference between the two sample variances C:difference between the two populatio

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A:ratio of the two sample variances B:difference between the two sample variances C:difference between the two population variances D:difference between the sample variances divided by the difference between the sample means 答案: ratio of the two sample variancesA 促进智力发展B 促进身体健康