【单选题】在平面磨床上磨削一平板,要求保证其高度尺寸,一般应限制工件的( )几个自由度。To grind a flat plate on a suce grinder, its height and size should be guaranteed. Generally, how many degrees of should be limited?
【单选题】In a contingency table a sample of 400 people is classified by gender and four hair colors (blond, brown, black, and red). How many degrees of are there?
【简答题】A multiple regression model using 200 data points (with three
independent variables) has how many degrees of for testing the
statistical significance of individual slope coefficients?A. 199 B....