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【单选题】
物体从距凸透镜12cm处移到距凸透镜20cm处，调整光屏的位置，总能在光屏上得到倒立、放大的像．由此可知凸透镜的焦距可能是（　　）
A.
10.5cm
B.
12cm
C.
20cm
D.
以上都不对
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