單項選擇題

緩和曲線采用切線支距法計算坐標的公式為()

A.x=ι-ι4/(40R2I02)+ι9/(3456R4I04)…
B.x=ι-ι5/(40R2I02)+ι9/(3456R4I04)…
C.x=ι-ι3/(40R2I02)+ι9/(3456R4I04)…
D.x=ι-ι2/(40R2I02)+ι9/(3456R4I04)…

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