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【单选题】
在一个包含两个变量【图片】和【图片】的回归模型中,如果遗漏其中一个变量【图片】
A.
如果遗漏变量 和变量 之间是负相关,不会影响 前的系数估计值
B.
一定会使 的系数估计值上偏
C.
即使在原来包含两个变量的回归中两个斜率系数都显著为正,也可能使变量 前的系数估计值为负
D.
将使变量 和残差项的乘积的和不为 0
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【多选题】应用基尔霍夫定律的公式 KCL 时,要注意以下几点( )
A.
KCL 是按照电流的参考方向来列写的
B.
KCL 与各支路中元件的性质有关
C.
KCL 也适用于包围部分电路的假想封闭面。
【单选题】固体NaCl、KCl、NaNO3、KNO3的混合物与水振荡达到平衡时,该体系的C和f为( )
A.
C=3,f=2
B.
C=5,f=1
C.
C=3,f=1
D.
C=5,f=2
【单选题】固体NaCl和KNO3的混合物与水振荡达到平衡时,该体系的C和f为( )
A.
C=3,f=2
B.
C=5,f=1
C.
C=3,f=1
D.
C=5,f=2
【单选题】The press(媒体) assailed the mayor for giving large city construction jobs to his brother-in-law's firm.
A.
searched for
B.
paid
C.
attacked
D.
fined
【单选题】NaCl、KCl、NaNO3和KNO3等固体的混合物与水振荡并达到平衡,且体系中仍有各物质的固体存在,则该体系的自由度F 为( )
A.
3
B.
2
C.
1
D.
0
【单选题】The press assailed the mayor for giving large city construction jobs to his brother-in-law's firm. Assailed means
A.
searched for
B.
paid
C.
attacked
D.
fined
【单选题】NaCl、KCl、NaNO3和KNO3等固体的混合物与水振荡并达到平衡,且体系中仍有各物质的固体存在,则该体系的自由度f 为( )
A.
1
B.
2
C.
3
D.
4
【简答题】The press assailed the mayor for giving large city construction jobs to his brother-in-law’s firm. A. searched for C. attacked B. paid D. finedA. 2. The press assailed the mayor for giving large city ...
【单选题】Conflict between the president and the press indicates that ______.
A.
the press publishes the truth even when it hurts the president
B.
freedom of the press is alive and well in the United States
C.
presidents have traditionally had little respect for the press
D.
the press is made up mostly of critics and cynics
【单选题】The press assailed the mayor for giving large city construction jobs to his brother-in-law's firm.
A.
searched for
B.
paid
C.
attacked
D.
fined
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