Put in the blanks appropriate prepositions or adverbs.These parks for certain will add greatly ________ the beauty of the city.
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Put in the blanks appropriate prepositions or adverbs.________ all her aches and pains, she walked for hours at a stretch and finally managed to join her comrades.
当模型存在异方差现象,加权最小二乘估计量具备()。
A. 线性
B. 无偏性
C. 有效性
D. 一致性
E. 精确性
能够检验多重共线性的方法有____
A. 简单相关系数矩阵法
B. DW检验法
C. t检验与F检验综合判断法
D. ARCH检验法
E. 辅助回归法(又待定系数法)
F. 逐步回归法