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【单选题】
有非平稳序列 ,其一阶差分序列经检验平稳、且样本 ACF 呈现拖尾性,样本 PACF 呈现 2 阶截尾性,则可初步认为对 应该建立( )模型 ,即对 其一阶差分序列 应该建立( )模型。A.
ARIMA(2,1,0) ， AR(2)
B.
ARIMA(2,1,0) ， ARMA(1,2)
C.
ARMA(1,2) ， AR(2)
D.
AR(2) ， MA(2)
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【简答题】列车故障时的运营模式。当列车发生故障时,部分车站可能处于停运状态,此时通过中央计算机或车站计算机的设置,允许已进入收费区的乘客和从故障列车上下来的乘客 通过 出站检票机。
【简答题】急躁易怒多由哪脏功能失职所引起( )
【单选题】John and Mark became separated because ______.
A.
there wasn't room for both John and Mark on the buoy
B.
John couldn't control the coat and drifted away
C.
Mark thought it safe to stay on the buoy but John didn't
D.
John had to stay in the boat to radio for help
【简答题】When was the library opened? It was opened in ________________. .
【简答题】1.When
he reads a book, his habit is to make a mark ___ the meaning is unclear to him.A. there B. wherever C. the place D. in which
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