【单选题】
如图所示，肥皂泡的内外半径为R<sub>1</sub>，R<sub>2</sub>，R<sub>1</sub>≈R<sub>2</sub>=R，则肥皂泡的内外压强差P<sub>1</sub>-P<sub>2</sub>为（）<img src="https://nimg.ppkao.com/2018-09/wangjing/2018092617562115233.jpg?sign=3666ad5f332135711f671fd510653a30&t=62d1f65b" /><br /> <img src="https://nimg.ppkao.com/2018-09/wangjing/2018092617563038288.jpg?sign=19ecf24ad61e48ba7ee2a4021c09b8c3&t=62d1f65b" />
A、A
B、B
C、C
D、D
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