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【单选题】
设(X,Y)为二维随机向量,D(X)、D(Y)均不为零。若有常数a>0与b使 P(Y=-aX+b)=1,则X与Y的相关系数A.
0
B.
1
C.
-1
D.
0.5
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反馈参考答案：
举一反三
【单选题】______ you have nothing important to do, why not come with me to the cinema?
A.
Since
B.
When
C.
For
D.
Because
【单选题】— Could you tell me ? — Yes. To take back my dictionary. [ ]
A.
why did you come here
B.
when do you come here
C.
why you came here
D.
when you come here
【单选题】Could you tell me ______ for the meeting yesterday? [ ]
A.
why did you come late
B.
why you came late
C.
why do you come late
D.
why have you come late
【单选题】-----Why ________ you come and play basketball with us? -----Because I have lots of homework to do.
A.
not you
B.
not
C.
not to
D.
don’t
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