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填表說明23—24頁中求所增水面寬若在分級水位間有河底轉折点,則必須自該轉折点,再分兩部分計算,即b_(L2)=[a′(1,2两点閒之4X/4Y值)]+[a′′(2,3
If there is a river bottom turning point between the graded water levels, it must be calculated from the turning point and then divided into two parts: b_ (L2) = [a ’(1, 2 2X 4X / 4Y value)] + [a "(2,3