• 2022-06-08
    If the ACF of some model cut off at lag 2, the model will be ____
    A: AR(2)
    B: MA(2)
    C: ARMA(2,2)
    D: cannot tell due to lack of information.
  • B

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    • 0

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    • 1

      二元函数f(x,y)=4x-4y-x^2-y^2的驻点是 A: (2,2) B: (-2,2) C: (2,-2) D: (-2,-2)

    • 2

      产生钠的两条黄色D线的跃迁是() A: 2P1/2→2S1/2,2P3/2→2S1/2 B: 2S1/2→2P1/2,2S1/2→2P3/2 C: 2D3/2→2P1/2,2D3/2→2P3/2

    • 3

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    • 4

      直线3x+4y-2=0与直线2x+y+2=0 的交点坐标为() A: (-2,2) B: (-2,-2) C: (2,-2) D: (2,2)