【简答题】研磨块的使用限度(有效磨耗量):H达到 mm前更换A. 10
【判断题】宴飲詩的本質,是一種美食政治。《詩經》中宴飲詩的兩大主題分別爲對禮儀的讚美和對和平政治的追求,同時,對違反禮儀的行為,也給予了最辛辣的批評,見《小雅·頍弁》。
【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】1950年,世界贸易额为610亿美元,2013年世界贸易额达到34.67万亿美元。世界贸易的增长速度高于经济增长速度,成为推动世界经济增长的重要力量。这一案例体现了
【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
【单选题】CRH2A动车组的踏面清扫装置研磨块运用限度为()mm
【简答题】曲柄摇杆机构中的最小传动角出现在 与 两次共线的位置时。