A. Because the cow is gone B. For fear the rooster would beat it C. Because the cock is drunk D. Afraidthe rooster would grab its water
A. 对 B. 错
A. 对回归方程 B. 自变量全体对因变量的显著性 C. 对回归系数的显著性 D. 对相关系数的显著性