在下图所示电路中,<img src="https://nimg.ppkao.com/2018-08/lina/2018081915345092479.jpg?sign=f260ecae4cd12933748f7a5df1b80967&t=62d3eb76" />当开关闭合时,将使()。<br /> <img src="https://nimg.ppkao.com/2018-08/lina/2018081915335663519.jpg?sign=45f3b40b38f9f7c5fccc06d2b5e29ea2&t=62d3eb76" />
A、R1烧坏,R2不会烧坏
B、R1、R2均烧坏
C、R1未烧坏,R2烧坏
D、R1、R2均未烧坏