A:1﹣ 2 ,1+ 2
B:1﹣ 2 ,3
C:1﹣2 2 ,3
D:﹣1,1+ 2
I want to go shopping ______ some new clothes for my cousin.
两个同心圆的半径之比为3:5,AB是大圆的直径,大圆的弦BC与小圆相切,若AC=12,那么BC=( )