右圖為某條河流的截面，形如拋物線，水深40公尺時，最深處O為頂點。當水深16公尺(B點的水位)時，水面的寬( )為64公尺，則水深25公尺時，水面的寬( )是？公尺。 (A) 40 (B) 60

問題詳情

右圖為某條河流的截面，形如拋物線，水深40公尺時，最深處O為頂點。當水深16公尺(B點的水位)時，水面的寬( )為64公尺，則水深25公尺時，水面的寬( )是？公尺。
(A) 40
(B) 60
(C) 80
(D) 100 公尺

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