用配方法将y=x2﹣6x+11化成y=a(x﹣h)2+k的形式为( )
A:y=(x+3)2+2
B:y=(x﹣3)2﹣2
C:y=(x﹣6)2﹣2
D:y=(x﹣3)2+2
Paul stayed up late to watch the soccer game last night and now he feels very .
细胞的全能性是指( )