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相关分析与回归分析相比，对变量的性质要求是不同的，回归分析中要求
A. 自变量是给定的，因变量是随机的
B. 因变量是给定的，自变量是随机的
C. 两个变量都是随机的
D. 两个变量都是非随机的
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黏膜内瘤变（）