【多选题】(2分)在回归分析中,关于估计标准误差正确的是( )
A.
估计标准误差大,回归直线代表性小,因而回归直线实用价值也小
B.
估计标准误差大,回归直线代表性大,因而回归直线实用价值小
C.
估计标准误差大,回归直线代表性小,因而回归直线实用价值大
D.
估计标准误差可以看作排除x对y影响后,y随机波动大小的估计量
【单选题】体内嘌吟代谢障碍,血液中尿酸增高,并伴有尿酸盐(钠)结晶沉着在体内的一些器官组织而引起的疾病是
【单选题】Question 6
A.
Because she doesn't want to spend too much money.
B.
Because most of the places have already been taken.
C.
Because there aren't many places to choose from in that area.
D.
Because all the new students are looking for accommodation.
【单选题】Question 6
A.
There is a great variety of foods.
B.
There is a great variety of nutrients.
C.
It is difficult to make your choice of food.
D.
It is important to fit foods together properly.
【单选题】Question 6
A.
It can only drive in flat areas .
B.
It cannot go over 130 kilometers per hour .
C.
It has no gas pedals and steering wheels.
D.
It has no safety devices.
【单选题】奥氏体钢与低碳钢焊接时,若选用的焊条金属合金化程度不够高或者熔合比很大,焊缝金属以及凝固过渡层将容易形成 ( ) 组织。