多项选择题

固体介质的老化可分为（ ）几类。 A.
电老化 B.
热老化 C.
环境老化

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单项选择题
A theorem that allows us to use thenormal probability distribution to approximate the sampling distribution of sample means and sample proportions whenever the sample size is large is known as the（）A、approximation theoremB、normal probability theoremC、central limit theoremD、central normality theorem
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