在完全透明的水下某处放一点光源,在水平面上可见到一圆形透光平面,如果圆形透光平面的半径匀速增大,则光源正( )A.加速上升 B.加速下沉C.匀速上升 D.匀速下沉不仅要答案,还要思路
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![在完全透明的水下某处放一点光源,在水平面上可见到一圆形透光平面,如果圆形透光平面的半径匀速增大,则光源正( )A.加速上升 B.加速下沉C.匀速上升 D.匀速下沉不仅要答案,还要思路](/uploads/image/z/3174962-50-2.jpg?t=%E5%9C%A8%E5%AE%8C%E5%85%A8%E9%80%8F%E6%98%8E%E7%9A%84%E6%B0%B4%E4%B8%8B%E6%9F%90%E5%A4%84%E6%94%BE%E4%B8%80%E7%82%B9%E5%85%89%E6%BA%90%2C%E5%9C%A8%E6%B0%B4%E5%B9%B3%E9%9D%A2%E4%B8%8A%E5%8F%AF%E8%A7%81%E5%88%B0%E4%B8%80%E5%9C%86%E5%BD%A2%E9%80%8F%E5%85%89%E5%B9%B3%E9%9D%A2%2C%E5%A6%82%E6%9E%9C%E5%9C%86%E5%BD%A2%E9%80%8F%E5%85%89%E5%B9%B3%E9%9D%A2%E7%9A%84%E5%8D%8A%E5%BE%84%E5%8C%80%E9%80%9F%E5%A2%9E%E5%A4%A7%2C%E5%88%99%E5%85%89%E6%BA%90%E6%AD%A3%EF%BC%88+%EF%BC%89A.%E5%8A%A0%E9%80%9F%E4%B8%8A%E5%8D%87+B.%E5%8A%A0%E9%80%9F%E4%B8%8B%E6%B2%89C.%E5%8C%80%E9%80%9F%E4%B8%8A%E5%8D%87+D.%E5%8C%80%E9%80%9F%E4%B8%8B%E6%B2%89%E4%B8%8D%E4%BB%85%E8%A6%81%E7%AD%94%E6%A1%88%2C%E8%BF%98%E8%A6%81%E6%80%9D%E8%B7%AF)
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