多元线性回归模型中，发现各参数估计量的t值都不显著,但模型的R2或adj-R2却很大，F值也很显著，这说明模型存在 A.
多重共线性 B.
异方差 C.
自相关 D.
设定偏误

A．Look for examples when they are reading and doing research about the ideas that they are going to present in their papers.
B．Copy the good sentences when they are reading and doing research about the ideas that they are going to present in their paper.
C．Recite the grammar rules on the grammar book.
D．Summarize the grammar rules of the papers they’ve read.