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【多选题】
对氯甲苯的结构中有A.
p–p 共轭和 p–p 共轭
B.
p–p 共轭和 s–p 超共轭；
C.
p–p 共轭， p–p 共轭和 s–p 超共轭
D.
p–p 共轭， p–p 共轭和 s–p 超共轭
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举一反三
【单选题】Which of the following is true of Chow test?
A.
It is a type of t test.
B.
It is a type of sign test.
C.
It is only valid under homoskedasticty.
D.
It is only valid under heteroskedasticity.
【简答题】Which of the following is true of the White test?A. The White test is used to detect the presence of multicollinearity in a linear regression model.B. T he White test cannot detect forms of heteroske...
【单选题】Which of the following statement about hypothesis testing is correct?
A.
Asymptotic tests are meaningless in finite sample.
B.
The Wald test statistics only works under heteroskedasticity.
C.
The Student t-test is invented by a student of Harvard
D.
The “F” in F-test stands for “Fisher”
【简答题】春节起源于商代的________,到现在已经有3000多年的历史了。
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