12 鐵路軌道於曲線路段應設置超高，其與直線段間之超高度須依一定長度遞減之，於臺鐵特甲級線，有介曲線時其遞減長度為介曲線之全長，若無介曲線時，則其遞減長度為？(A)超高度之 400 倍 (B)超高度之

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12 鐵路軌道於曲線路段應設置超高，其與直線段間之超高度須依一定長度遞減之，於臺鐵特甲級線，有介曲線時其遞減長度為介曲線之全長，若無介曲線時，則其遞減長度為？
(A)超高度之 400 倍
(B)超高度之 600 倍
(C)超高度之 800 倍
(D)超高度之 1000 倍

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