单项选择题

各级党组织要把( )作为主要职责和根本任务,扎实推进党的作风建设。

A.管党治党
B.选人用人
C.干部选拔
D.干部考核
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问答题

考虑单参量的估计问题。若线性观测方程为
   xk=hkθ+nk,  k=1,2,…,N
   (1)证明θ的线性最小二乘估计量为
   
   (2)若各次观测噪声nk的统计特性为
   E(nk)=0,  ,  E(θnk)=0
    证明估计量的均方误差为
   
   (3)如果观测噪声的统计特性为
   E(nk)=0,,E(θnk)=0
  应如何计算估计量的均方误差
   (4)若观测噪声nk的统计特性为
    E(nk)=0,,E(θnk)=0
  应如何计算估计量的均方误差
   (5)若观测噪声nk的统计特性为
   E(nk)=0,,E(θnk)=0
   应如何计算估计量的均方误差

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