A:that; that; which
B:where; that; which
C:where; when; that
D:that; where; that
In 1989, Audrey made her final ____ (出现) in films.
若向量a→与b→不共线,a→·b→≠0,且c→=a→-a→·a→a→·b→b→,则向量a→与c→的夹角为( )
下列关于二次函数y=ax2-2ax+1(a>1)的图象与x轴交点的判断,正确的是( )