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【单选题】
已知x(n)={1,2,3,4}，则x((n+1))6R6(n)=A.
{1,0,0,4,3,2}
B.
{2,1,0,0,4,3}
C.
{2,3,4,0,0,1}
D.
{0,1,2,3,4,0}
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举一反三
【单选题】下表是1950年—1998年某地区居民购买理财产品的比例。根据该序列的自相关图以及偏自相关图，可以用下列哪个模型来进行拟合较为合适?（ ）。195019511952195319541955195619571958195983.563.17176.370.580.573.675.269.171.4196019611962196319641965196619671968196973.678.884.4...
A.
AR (1)
B.
MA (1)
C.
ARMA (1,1)
D.
ARMA (2,2)
【单选题】_____ I believe in you, I don't ______ your viewpoint ______ she is failing to find a well-paid job again. [ ]
A.
When ; submit ; which
B.
As ; subscribe for ; where
C.
If ; apply for ; /
D.
While ; subscribe to ; that
【单选题】—Mary, don’t you believe your sister? —Yes. I believe _____ she says.
A.
however
B.
no matter how
C.
whatever
D.
no matter what
【单选题】She is always smart and cheating others. I can't believe she was ____ by him this time, who is a little dull boy.
A.
taken up
B.
taken down
C.
taken in
D.
taken on
【单选题】听力原文：M: I asked Linda out yesterday. W: I can't believe it! She is gorgeous. Surely she turned you down ... M: She said yes! We have a date for tonight, so she agreed to meet me here. W: Really? Where...
A.
She turned him down.
B.
She agreed to meet him.
C.
She didn't say anything.
D.
She was very excited to date him.
【单选题】下表是1950年—1998年某地区居民购买理财产品的比例。对该序列选择AR（1）模型并通过极大似然估计法进行参数估计，对残差白噪声检验的结果为（ ）。195019511952195319541955195619571958195983.563.17176.370.580.573.675.269.171.4196019611962196319641965196619671968196973.678....
A.
P<0.05 ，残差为白噪声序列，拟合模型显著有效
B.
P>0.05 ，残差为白噪声序列，拟合模型不显著
C.
P>0.05 ，残差为白噪声序列，拟合模型显著有效
D.
P>0.05 ，残差为非白噪声序列，拟合模型不显著
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