【判断题】在研磨场地可以进行冲床的正常使用,而不会影响研磨工作。()
【单选题】In Chapter 5, for a linear regression model: 【图片】, which assumption is not necessary for the consistency of the OLS estimator?
A.
is jointly stationary and ergodic.
C.
has full rank and is finite.
D.
has full rank and is finite.
【单选题】For a linear regression model with i.i.d. sample: 【图片】, which assumption is not necessary for the consistency of the OLS estimator?
A.
is normally distributed
D.
None of the above conditions
【单选题】For a linear regression model with i.i.d. sample: 【图片】, which assumption is not necessary for the consistency of the OLS estimator?
B.
conditional homoskedasticity
D.
None of the above conditions
【简答题】[WJ-200-100] 通过集线器组成的以太网,它是一个物理上为( )而逻辑上为( )的以太网。
【简答题】说明构成产品成本要素,以及降低产品成本途径。