A:22
B:2
C:322
D:22
函数f(x)的定义域为开区间(a,b),导函数f'x在(a,b)内的图象如图所示,则函数f(x)在开区间(a,b)内有极小值点( )
— Which of the two magazines will you buy?
— I will take _______. ______ are useless to me.